Cagliostro:  Continue as before, try to disable, imprison, or 'turn' 
the defenders.  Tell them that Erica is possessed by something, and 
this is a family intervention.

Jean:  Act intimidating but try to get MechaJean trumped out before 
the shield is dropped - he would prefer not to be the target of 
whatever counterattack Erica is cooking up, but doesn't mind trying to 
make her think that MechaJean would be an integral component.