Trunks recognizes exactly what that charging up means, and it is NOT good. He actually bites off a curse, and dives further in. "Cassie, GUARD MOM!" Because this is getting out of hand, and they need to end this. Trunks is trying to get a good moment between ki blasts to pull his sword from his Arms Band, but it just isn't happening.

Alright, fine, they do this the hard way. Taking a few pot shots with one hand, Trunks keeps his other back, charging up energy. NOw, he just needs to get a good shot at the tail.