Jack had been just about to find cover, with his jobs disabled and without the reassuring feel of the energy flowing back into him? His usual fighting strategy wasn't going to serve anyone well here.

But then, oh then, Sparks tosses him an incredibly welcome sight, the gun smuggled out of the Torchwood base. He almost fumbles it, he's so happy to see that laser blaster that he thought was in lock down. "Gwen Cooper, you beautiful woman...."

Dials the damage to maximum as he turns and aims right at Palitutu. The Doc's last words to him are still ringing in his ears as he doesn't hesitate this time. He wanted to know what she had to show them. But if this is her last demonstration? One last way to help them, in her own twisted way. Jack fires.