Some hamsters have a tendency to get that "act like a lemming" feeling while out of the cage. Darwin, my syrian, as tame as he is, gets antsy being held & he wants to run & play. He's tried to take an unexpected, flying leap out my hands a few times (one time jumping almost 4 feet to the floor...he was just fine
). I'm not an expert by any means, but I think this isn't anything out of the ordinary.
I'd continue to keep an eye on him just on case, but I'm glad to hear that he seems to be doing well