The Doctor keeps walking on. Ignoring Cassie, that is till she grabs his shoulder. Then he stops. He didn't put the guns there. That shouldn't have been there in the first place. Even if he knows, that she is right. He also did put them in danger but, he figures he did discuss the matter first and it was refused. He hates this merciless side of himself that is showing right now and one of the reasons, he's trying to run.

But, he doesn't want others to die either and that's clearly in his eyes too. He doesn't reply to Cassie but he is getting ready to use Venusian Aikido if she tries anything. Even if he hasn't done that yet in this body and would be a bit off-center. He is also not afriad. He's been up against, gods, billions of Daleks, and all sorts of horrors in time and space. He's arrogant and cocky to the point of that monsters have nightmares of him. Which, The Doctor does believe.

When the other arrives, Ten wants to run. Run where he's not sure since it is limited space and not infinite like this Tardis.

"This doesn't," The Doctor stops, when he realizes that whomever this is, is trying to defuse this. Something The Doctor usually does and should be doing right now.