C-3PO had been through enough battles that many of the Rebels in the strike team considered him a good luck charm. That isn’t what Han considers him.
If a battle that opponent initiated just ended, initiate a new battle at same location. ‘Reacts’ are allowed only for opponent, but cards may not ‘react’ away or hide from battle. Loser ignores battle damage. If your droid present there, add one battle destiny (two if C-3PO).