QUOTE (RHat @ Jul 16 2013, 04:49 AM)

The guideline Bull posted was "if it directly impacts the enemy". So, if the enemy IMMEDIATELY has to roll to not fall, that's an attack.
So remember, you can cast an ice sheet as a simple action if it's 1ft in front of an enemy, but put it under them, nope! Sorry the laws of the universe just rewrote themselves to deny your attack.
Also by that exact wording, grenades are fine (the enemy doesn't roll until later), but I'm pretty sure Bull explicitly said that was metagame cheesiness and shouldn't fly.
So basically, there is no rule. Just BS your DM into believing whatever you are doing is not an attack, and you get to win the game.