He may have hurled outside the store, or he might be at the point of Alcohol poisoning and the body is so intoxicated that it's natural systems are unresponsive.
I dunno. I've witnessed some highly intoxicated people trying to do ordinary things, like walk through a store, and it usually ended up looking like that!
I think I've only been that drunk once - that scary peaky drunk where for some reason you don't puke. It sucked. Drunkest I ever got was from slamming 6 Fosters oil cans in about 1 hour. I was crying and demanding that my dear lord stop my misery