I've found time to look at the vids and I have never handled a bitis sp. have no experience with true venomous snakes but i have to say he did look to be a bit brutal with the puff adder, maybe others with hots will tell me its as hard as it looks but this guy didn't care from what height he dropped the adder from and didn't seem to try adapt an easier way of putting the snake in the plastic box other than throwing it in and trying to slam the lid on as hard as possible (with bare hands).The second vid (I think) is a perfect example of how NOT to get a puffy out of a cage. He has two hooksticks, almost criss-crossed trying to manipulate an animal that is on the move. There are much easier and better ways of removing the animal.
And in the vid where he feeds the gaboon is it not a bit silly making the snake strike out through the front of the enclosure?