Hmm, just two days ago I had a "panicked" sectoid soldier toss a grenade at one of my guys during his turn. Shouldn't his TU be at 0 during his round ? It was no reaction-fire during my turn!
Any ideas ?
are you sure the sectoid was panicked? if you did one (or several) successful psi-panic-attacks, it just means that his morale was lowered.
if you got the message "sectoid soldier panic" right before he threw a grenade at your guys, that may just have been his panic reaction: a unit that panics can do one of several things, including dropping his weapon, randomly shooting around, running away... I don't know if "throwing a grenade" is handled in the same way as "shooting", but I guess the AI handles both as "attacks", so that may just have been his "attack a random target" behavior... and your guy was the unlucky target.