While talking about snakes ingesting substrate.....About 30 minutes ago,I fed my snake in his waterbowl like usual, and he always(from what I've seen in the past couple weeks that he's let me watch) eats in/over his waterbowl. But today he decided he wanted to eat in his hide. His hide and his bowl are a combo, so he can stay partially in his hide and still get to his bowl I didn't notice he was doing that on the first fish until he was almost done swallowing. He had a piece of aspen hanging on his mouth, so I'm not sure if he got any down with the food. I moved him into another container(with no substrate) to finish his food.

I'm a little concerned...Is there anything in specific thing I should be looking out for now(possible symptoms)? Will it pass in his poop?