I used c_move for the player but I had neglected to change ent_move (old syntax) in the enemy action. Bad me. Now they're hacking away blissfully at each other.
c_setminmax (ENTITY* ent) Sets the collision ellipsiod and bounding box coordinates of the entity to it's real proportions, and sets the entities' fat and narrow flags both at on.
Tompo: That's right. But if you want to use custom proportions, as I've done, rather than those of the first animation frame (the real proportions) then you must set fat and narrow on. That's what I read in the manual. But I haven't tested to see if it really matters.