Make some plain instant rice mix it with some wet food. Feed it to Panther if you have to (small bites at time). Also good thing is chicken, beef baby food to stimulate appetite.
The rice will digest well and settles tummys (in humans also).
I've known people to mix rice with hamburger (cooked/drained).

I would just leave Panther alone and let the door open to carrier. Probably at this point he is peeved at you for all thats been done to him in last 24hrs.
Eventually he will come out