If they can show that they served beer to an obviously intoxicated man they should be held responsible, but how the heck are you going to prove that? he could easily have gotten someone to buy for him or brought in his own flask. he could also have had 6 beers (not drunk yet) bought 2 at 1 stand, bought 2 at the next stand, bought 2 from a vendor (its a 2 beer limit per purchase if i remember) then consumed the remaining 6 in short order. bottom line, unless they can find the guy how are they going to prove anything? aramark and the mets are going to say "as far as we know a perfectly sober fatso fell on you, thats not our fault, prove otherwise." unless they settle for PR reasons which is of course a possibility.