This is a wild trapped red-tailed hawk. Unlike a captive bred raptor, this hawk has already been coached by its parents as to what prey and food look like and has learned to be successful at capturing it. When trapping wild hawks for falconry purposes, experience counts. Little things like if a red-tail has clean or dirty feed tell a falconer a lot. A hawk with clean feet is often a mouse specialist while those with dirty feet are often feeding on rabbits.
Hunting with a raptor requires many specific things be done including: actively flushing game for the hawk, carefully "making in" to approach the hawk while on its coveted prey, and the slight of hand "trading off" (in this case with what the falconer calls "ice cream"!). Eventually, the team of raptor and "human dog" meld with the hawk literally pointing rabbits and the falconer flushing the rabbits in such a manner as to give the hawk the best chance. Note the comments at time 5:23 and 6:03.