Going into battle, standing in front of a medusa and 2 nagas. I have line of sight on all 3. The DM says to make wisdom saving throw, without describing why.
After failing the saving throw, I'm mind controlled by a naga. When I question why, the DM tells me the naga cast a spell (but wouldn't tell me what one, I assume dominate person, or charm person). To which, I respond, "okay I would use counterspell when I see the naga casting a spell in front of me though."
The DM claimed I should have used counterspell earlier.
Considering that I could see the creature, am I correct in assuming there should have been a description of "you see the naga wave it's arms" or "you see the naga begin to chant" before being asked to make a wisdom saving throw? Something to indicate this was a spell and not a effect of the room or something I couldn't avoid?
P.S. He knows I have counterspell in a ring of spell storing ready.
Follow up: I have always been under the impression that a counterspell needs to be used as a reaction to noticing the components of a spell(VSM) being used; and cast before making a saving throw roll. According to my DM it can be used after the roll, and I should have said "counterspell" as soon as he said "take control"