I trust ASF's with my snakes far more than a rat or mouse. All the rats and mice I've ever fed, never seemed intimidated by the snakes. I've also opened up my tubs to find a mouse or rat curled up sleeping with a snake on numerous occasions.

ASF's on the other hand seem to know what the snakes are and they keep their distance. I've never had an issue with an ASF with a snake as of yet.