To address how uncommon regurges are (and also not to scare you) but I've kept snakes for almost 5 years now. We have at present just under 50 snakes from three different species. I've seen a total of 2 regurges in all that time and with all those feedings. One I suspect was due to feeding too soon after a tub change and with a snake I knew tended to be antsy and stressed easily to begin with. Big mistake on my part and it was months until I got her properly settled back in. The other I'm not sure why the regurge happened and it never did again.

I have a few that if bothered at all during the swallowing process will back the prey out of their throat fast and then ignore it completely. You learn to feed those ones last and tiptoe around a LOT in the snake room.