[ Ford perks up when Lysithea mentions a controlled fire. ]

If you have the means to produce one, it would be an enormous help.

[ He taps the window with the chair leg again, eliciting a hollow tonk. ]

There aren't any signs of nails, so this pane may have been glued in place. If you can apply heat around the edges, I believe it'll weaken the adhesive and allow us to easily force it out of place.

It may also set the wall on fire! But we'll wait until that happens to worry about it.