Girlfriend. Right. Cyber race. This is all sounding awkwardly familiar.

"This may surprise you, but I have experience with cyber races spreading across the universe, erasing worlds, all that fun stuff -- and Ianto and I have a relationship already where he... questions my sense of humour and I assure him things will be fine. It's going to ruin the dynamic if you shoot him. Now, if Lisa is really as dangerous as you all say shouldn't we be looking for her instead of shooting each other?"

Just a thought. He gives a cynical, exaggerated shrug. Come on, lower the gun at least for a second.