He wasn't hunting, they don't actively hunt for food. As mentioned before, they ambush hunt from burrows (in captivity, from hides).

Looks like he was doing his evening exploring (and he was probably checking for weaknesses in the top for a means of escape if possible.

If he just does that casually in the evenings, and doesn't seem frantic about it, nothing to worry about.

If he's doing it constantly, even during daylight hours, he's likely displaying stress behavior.