The Doctor was good at taking advise at times and this was one of them and he looks over his shoulder to see Liz who's torching the trolls. He goes to grab hold of Brenton. "Come on!" He looks at Jack and he can sense something is off with this one. "Right, there's no time for introductions. Let's go before we.."

He looks to see the trolls defeated by the attack from Liz and then there's the assault from above thanks from the dragon. "And it seems we've had a little intervention from one of the locals." He looks around for a bit. "Hello!" The Doctor's knowledge of creatures of other worlds being friendly more than hostile can sometimes be a problem. "And, I should say, thank you also for the help... "