Fortescue's agreed to help in order to aid the Doctor's plan, and also to keep an eye on Dilandau. There are little sirens going off in the back of her mind, but she keeps them at bay for now. If the Doctor's plan manages to work, they don't need to worry about the flames. As long as it works. If it doesn't... well, they'll come to that bridge later, and hope it doesn't burn down.

She shakes her head when he offers her the bottle and the match, however. "I don't need it," she notes. To demonstrate, she holds up her right hand and, very carefully, calls on the energy she'll need for this little stunt. Her 'trigger finger' lights up with flame, all around it, a subtle little fire. No need to make a big deal out of being a human flamethrower, at the moment.