This is not unique to people on meth, and just underscores why guns are a sub-optimal weapon in CQB. In reality, a person is reliably stopped dead in their tracks if hit in the thigh bone, hip, nervous system (spine/head) or heart. Any other hit, and they have anything from seconds to hours where they remain nearly fully functional.

Note that most of the body is not one of these critical zones. Hit someone with three lung-shots at 3m range, and they'll still be able to reach and stab you. This is a large part of the debate regarding the "stopping power" of various types of ammunition (i.e. how much of the ammunitions momentum is imparted into the target, physically stopping them), and is a large part of the reason expanding ammunition is preferred for close-range exchanges (e.g. police).

A baton strike to the liver or knee will physically shut down part of your body. Just look at any professional fighter that receives a solid strike to either and see how they go down. This has nothing to do with meth or adrenaline, but is a physiological response to the strike.