I'm not saying i didn't laugh too, but that could have really hurt him

yeah , the size of that concrete slab was kinda concerning at  first glance , but the way it falls it's most probably close to slight noticeable bump.

still I'm assuming the desired effect was to punish him for slacking off, but in order to do that, at least 10 minutes were spent hauling those blocks over there and setting them up as dominos

worth the effort .