Yes, with my first grenade, certainly, I'd forgotten to factor the AI's turns into the total. The second grenade was much less forgivable, though - I simply hadn't left myself enough APs to get properly out of the way!
Fancy setting something else up? I'm part of a four-player practice game that that's taking a while to get going, and elsewhere xeno is doing his (?) Worst to mu guys in Oddworld, so I could do with a distraction from both...