Can a Dark Charmed hero be forced to fire a cannon?
Obviously he has to already be in position.
For: No reason why not I can think of?
Against: A nasty way for the OL to risk/try exploding a cannon which is currently overheated - which permanently gets rid of the cannon (ouch!), damages the Revenge and does a reasonable amount of damage to the dark charmed hero and any other hero nearby!
Perhaps best done aimed at a dodging Lt, if another hero is not available as a target... High risk, high reward tactic?