Henry said:
Daniel, you little rules-lawyer! Did you just weasel your way into taking a Concentration check for casting and springing???
Hee hee! I'm arguing this halfway as a DM, halfway as a player here.
As a DM, I'd require an easy concentration check and a middling jump check to succeed at this (you'd have to jump at least 3' straight up if you wanted to catch even 12 inches of your opponent in the blast, in this case, and without the boots on, this is a DC 18 jump). I don't think skill checks are too easy -- in fact, I think the game is a lot more fun if people use their skills more often, so I think if anything they're too difficult. But this is obviously a play-style issue; neither of us are right or wrong on it.
As a player, I'd be perfectly happy if the DM let this action succeed automatically, and I wouldn't think that was a strange ruling: jumping in the air while casting a spell sounds only slightly more difficult than walking and chewing gum at the same time. But I wouldn't mind if the DM made me do some skillchecks to succeed at it. I *would* be annoyed, as a player, if the DM vetoed the idea outright, and I'd be peeved if the DM accused me of munchkinism because I tried to do something not entirely covered by the rules.
I agree, however, that a spell that erupts from the floor can't erupt from the ceiling. No harm in a player asking, but I'd probably rule against it.
If it were a spell like spike stones, however, I'd probably let it happen: in such a case, references to "ground" probably refer to any large, relatively flat stone surface.
Daniel
Daniel