[RPG] Can a creature on its turn move up to a door, open the door, and continue moving

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I've always imagined that, unless a creature is taking free actions (hence, also, swift and immediate actions, all of which can be taken in conjunction with other actions), actions are taken sequentially, one action needing to end before another action can begin. However, after trying to puzzle out mounted combat again, I realized maybe I've been limited in my imagination.

While taking a move action to make a normal move to travel up to its speed, can a creature simultaneously, at any point during its movement and without stopping, take a move action that does not involve moving any distance? For example, can a creature take its first move action to make a normal move; take its second move action to, for example, sheathe a weapon or open a door; then continue moving up to the remaining distance from its first move action?

Note: Please show some sympathy for my ignorance if you've always played that Yes is the answer. If you've always played—like I have—that No is the answer, let me explain where I'm coming from. During mounted combat, it's the mount's actual movement that prevents a rider from taking full-round actions that also involve movement, the idea seeming to be that the mount's movement replaces the movement the rider would've taken (so a mount that must travel 10 ft. or more to a foe prevents a full attack by the rider, for instance, because the rider didn't start with a full-round action near enough the foe). However, even if the mount moves, the rider continues to be able to take non-movement move actions at any point along the mount's movement. What I don't know is if this situation is unique to mounted combat or should occur generally.

For example, one of my frustrations as a player and a DM is the difficulty creatures have in getting through doors: opening a door takes a move action, so it takes a creature its entire turn to move 10 ft. up to a closed door and open it. However, if the creature can move 10 ft., open the door, and, say, continue moving 20 ft., that's not nearly the issue it once was.

I've tagged this question as I'd really like to see either position supported by a text as I am uncomfortable extrapolating a general rule from implications alone (for example, the rules for mounted combat, the lack of a move-a-little-then-take-a-move-action-then-move-a-little-more feat similar to the feats Shot on the Run and Spring Attack). Likewise, I've tagged this question because, while as a DM I'm more interested in a answer, I'm a player in a Pathfinder campaign and that game, a D&D 3.5 offspring, uses an identical turn structure and may have additional information on this topic.

Best Answer

No. Unless you have some feat or special ability that allows you to take another action (be it a move action or standard action) during a move action, or an ability that let you open doors as part of another action, or allow you to do those actions as part of a full-round-action. Or a special rule that allows an exception to taking actions as another type of action, such as mount/dismount steeds as free actions with a DC 20 ride check, or channel energy as swift action as an attack action.

Otherwise, all move actions must start on square A and finish on square B, as long as your path isnt blocked in some way.

Alternatively, it seems that the intent of the game designers was that doors, unless they somehow block your path, shouldn't be that hard to open/close. We can read more about this on this post from 2009.

There is much discussion about "how long does one person takes to open or close a door while running" or "what kind of door is it?" or "what way does this door open". But, as a GM, you do have some backup on the rules if you decide that opening/closing doors should only take part of your movement instead of another move action.

Terrain and Obstacles

From tangled plants to broken stone, there are a number of terrain features that can affect your movement.

Difficult Terrain

Difficult terrain, such as heavy undergrowth, broken ground, or steep stairs, hampers movement. Each square of difficult terrain counts as 2 squares of movement. Each diagonal move into a difficult terrain square counts as 3 squares. You can't run or charge across difficult terrain.

If you occupy squares with different kinds of terrain, you can move only as fast as the most difficult terrain you occupy will allow.

Obstacles

Like difficult terrain, obstacles can hamper movement. If an obstacle hampers movement but doesn't completely block it, each obstructed square or obstacle between squares counts as 2 squares of movement. You must pay this cost to cross the obstacle, in addition to the cost to move into the square on the other side. If you don't have sufficient movement to cross the obstacle and move into the square on the other side, you can't cross it. Some obstacles may also require a skill check to cross.

On the other hand, some obstacles block movement entirely. A character can't move through a blocking obstacle.

You will see that many posters do rule it this way, opening a door takes 5 or 10 feet of movement instead of a move action. Personally, i would rule that if the door is open (ie: unlocked) it takes 10 feet of movement, if it's locked but you got the key, or if it's too big (like a double door), or too old (large dungeon metal or stone doors), it takes a move action.

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