 FACT: When Marv slips and slides down the outside stairs to the  basement, he is shown to slip at the top of the staircase and land  very hard on his bottom and then slide all the way down into the  basement on his bottom. Hitting the top stairs as hard as Marv did  and then sliding down that many concrete steps would cause severe  injury and fracturing of pelvic bones and tissues and would also  very likely cause dislocations/fracturing of leg and spinal bones,  and anyone in that condition would absolutely not be able to get up  on his own and would have to wait for paramedics/police to lift him  up and get him out.