Keith said:
Why does the character think the opponent stopped instead of continuing to move after they lost sight of them?
This character is... what, 10th, 12th level? If he's anything like most 10th level rangers, he's been chumming around with (probably) a wizard and a cleric for the last several years, getting into a whole lot of combats.
And
every single time he's seen those two guys cast spells, they've stopped moving around and stood in one place while they do it.
It's a completely reasonable assumption for the ranger to make, based on his own experiences, that someone who's casting a spell won't be running around while they're doing it.
This cleric just produced a wall of magical mist. The reasonable assumption says "He's standing still while he's doing that - if I shoot fast, I'll catch him before he can get too far away."
Now, since the Mist was Quickened, if the cleric hasn't stopped to cast Ethereal Jaunt, the ranger's guess "He's still in the same place, because he's casting" would have been wrong, because the Quickened spell
effectively lets the cleric cast "while moving" - he can move-cast-move.
But he
did stop to ccast another spell, so the ranger guessed right.
Not based on the player's knowledge that "this is a game with a turn-based initiative system", but based on the ranger's knowedge that "Clem and Wally always stand in one place while they cast spells, so maybe this guy does too."
-Hyp.