I was feeding my 1 year corn snake as I always do (2 mice in a separate feeding container), though I left the room to let him do his business. When I came back, he had only eaten one and was far more concerned with escaping the enclosure, so I used some tongs to hold the mice and entice him to eat it. He did, though he seemed a bit scared. I left again for about 3 minutes, and when I came back I picked him up and put him in his typical cage. However, when I went to clean the feeding enclosure, I noticed this... My question is, is this vomit or just poop? Should I be concerned?