I like the doctor. I think he's steeling blood and that's why he's trying to get the hell ...

I think there was rather the problem that previous Nux jumped from the roof im the docs appearance and killed himself. The doc also saw his 'body' lying outside. There is surely nk way to clean it up without people knowing. Hence take some blood along while you flee from the scene, I think the blood is more compensation for not being able to stay as a doc there anymore and get some daily blood. ╮(￣▽￣)╭