First of all, trust your snake. They know what to do, and are good at doing it.
Secondly, make sure your feeder rats are well fed and watered before you offer them to your snake. Also, don't grab the rat by the tail and drop it in, pick up the rat, that way they don't get put into panic mode. If a rat doesn't get nailed the second it enters the tub, they usually just run around sniffing everything, (snake included) and pooping everywhere. Then sit in a corner and clean themselves.
Me personally, I stick around with my tongs just in case they don't get the best catch. Live is by far the easiest way, imo. Cheaper too, because I don't waste rats! :p
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