Player A has a breakthrough skill in his graveyard and enters battle phase with a Face up Sabersaurus
Player B has a face up Evolzar Laggia with materials
Player A attacks the Laggia and chains forbidden lance
Player B chains Laggia's effect
Player A chains breakthrough skill in his graveyard to negate Laggia's effect
The question is are you able to use breakthrough skill's second effect (banish from graveyard) during the battle phase of Player A's turn? I always thought that you can only use the second effect during Player A's main phase.