We had a Valuable snake get loose at the Daytona beach reptile expo last year. We found him the next AM, but he also ended up stuck on someones Duct tape at the next table. Fortunately he only suffered about the same fate as yours. A few busted scales and A poor attitude. We did not however get the bubbles under the skin.. He healed perfectly but went off of food for a few weeks...
Do have him checked By a vet however for the air bubbles... Perhaps it'll go away but I would not risk it over a few dollars..