I keep ferrets, rats, and BPs in the same room. The ferret cage is next to the snake rack. I foster rescue ferrets so there are constantly weasels going in and out of my place. I haven't seen any behavior difference in either species other than the ferrets trolling the rat rack for an extra meal. My snakes haven't acted any different either way. I'm guessing your snake(s) are just getting used to your new fuzzies. They do have a different new scent after all.
I have introduced my snakes to my ferrets to see if there was some sort of reaction. First through the cage and later without any barriers. I was trying to decided whether or not housing them in the same room was safe. Both ferrets and snakes did nothing. The ferrets had zero interest. The snake wasn't defensive or doing anything really. I suppose if my snakes were a boa or some other more aggressively feeding species, I would have been concerned for the ferrets' safety. I suppose it's a good thing BPs tend to be picky and stick to rats or mice.
Side note: the rats don't act fearful or any different in the same room as two predatory species. They can't see each other any way. If they were so stressed out, they wouldn't reproduce.
Also while a ferret(not weasels in general. But ferrets specifically) may kill a snake out of playfulness(being too rough for example), they wouldn't actively 'hunt' them. They need to be taught how to hunt. I feed whole prey to my ferrets and many other fosters and rescues. And they all had to be taught how to kill and eat prey. Otherwise, they would just sit and cuddle with the feeder or use it as a toy.
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