That requires the assumption of them having considerable balance and ability to brace. Look at those ankles, they are comically small pivot points holding up all that girth. One solid movement would tip the cow easily. And at that weight, a full on fall to the ground is incredibly damaging.

While I don't know the rules, I feel like all fighting sports have a rule against "just laying on the floor" which is then where this would be because there is no getting back up either.