Oriental Ratsnake interrupted while dining

Since people seemed to like stories . . . I was in our cabin during the day at Chitwan NP, probably trying to figure out some bird ID. Suddenly there was a commotion out in the garden and I ran out to calls of "snake, snake" grabbing my camera. Sure enough, they had found a snake, which as I looked at him and got off a few photos, I noticed that it was in the middle of eating a frog it had killed. As several of us stood there, the snake stopped in the middle of swallowing the frog and looked up at us. The expression of its face (as seen here) seemed to be showing that it was thinking over whether to be safe (i.e., spit out the frog and flee from these big dangerous humans) or satisfied (finish swallowing the frog and get its dinner, but risk that the humans would harm it which it would find harder to avoid being full of fresh frog). It made the nomally wise choice and went fror safety - spit out the frog and disappeared beneath the roots of a tree. I felt horrible that we may have cost it its dinner, so I was very relieved that when we cam back an hour later, the frog was gone. Hopefully the snake had returned an finally gotten its well deserved meal!