"This plan has a million ways to fail. We should actually incapacitate whoever it is to the point that he can't fight instead of trying to build some strong cage around him. How quickly do they actually heal?

Because if we're using that building we need to be absolutely certain that there won't be any witnesses whatsoever, which seems difficult if there are squatters or vagrants of any kind. And as for when we're fully done..." Well. Perhaps his silence speaks for itself. There's only one way to make sure that he won't bother them at all in the future.