League-of-legends – Can Shen teleport Fiora around the map

What you can do, is use some aoe, she can't be targetted by the enemy team but she can still get damage from persistent aoe. For example Morgana's aoe pool, while dancing around in the pool it can still damage her. Aoe slows will work aswell since when she stops waltzing she might be slowed making it easyer to kill her. Thus in team fights you might die but your team will be able to kill the squishy dancer.(I'm not sure but maybe for example Ziggs can still lay down his minefield, and she may hit em while waltzing.)

P.s. noticed this last night but towers still fire on her while waltzing... don't know if this is a bug of planned. Anyway the official website sais not targeted by enemy team, it doesn't say anything about towers.

Edit: You can also spread out and take the full force of the ultimate, since it does less damage the second hit she does. I think it is 25% the next attack on the target. Or you can stand close to eachother with 4 and let others tank a few hits but they will take 100% damage the first hit so that might not be so good.

As long as the spell hasnt shot yet, like to use your example Caitlyn's ultimate. if shes aiming her shot and hasnt shot the bullet, you can apply the extra damage as long as you can do it before the hits the enemy. As the damage isnt applied until the target is hit, any buffs or anything like that calculate when the champion is hit as opposed to when you start casting a spell. Thats what makes sense to me.