I've never seen it with my ball pythons, but I have many carpet pythons that feed like that, just stick the food by them, they slowly open their mouth and start working it down. It's quite annoying actually because I have to hold it there for a bit til they got enough in their mouth to hold it themselves, otherwise they drop it and don't eat it. It feels like im bottle feeding. They haven't bit me like that though.
But that was a feeding response, nothing aggressive about it at all. I'm not sure why you're so nervous about being bit by a ball python? I've been bit by dogs, cats, birds, small rodents, bearded dragons, bugs of all sorts, and kids. I'll take the ball python bite over any of those. If the ones on the list don't make you nervous, just tell yourself you have an irrational fear, it's most likely not going to bite and if it does, its nothing. You bleed for 10 minutes and it's over.