The first time we tried to feed mine my g/f did it in a separate enclosure and he didn't take it. What worked for me was thawing a hopper and waiting til around 10pm or so when he sticks his head out of his hide. I dropped the hopper in about 4 inches or so in front of his hide and walked behind a corner and peeked around so he couldn't see me. I know, I'm weird. Within a minute or so he came out, grabbed it, and pulled it in his hide. Saw him come out a minute later or so to fully finish swallowing it. After you thaw it in slightly warm water for a couple hours, right before you drop it in, put it in some how water for a couple minutes to get a good heat signature. Mine had no problem taking it this way. Make sure you put the mouse in a platic bag to thaw it, and if you are feeding live then I would just drop it in and make sure he can't see you. I fed him this way the first 2 times then switched to live in a separate container, but that part is up to you.