Sometimes when a Demigod uses an ability (seems to happen to ANY demigod and after an offencive ability) they get "stuck". Not as in can't move, because moving fixes the problem, but as in if they dont move they refuse to do any sort of attack or cast any ability. The only way to clear this is by moving the DG. This appears to be when both demigods are standing on the same spot, and both cast offence on eachother.
This problem is intermittent.