A quad that loses three or four of its legs cannot move. It automaticallyfalls and has 0 MP available. It cannot prop itself up to fire,change hexsides or attempt to stand and is considered immobile.
Three destroyed legs: Functions with the same restrictions described above for a biped ’Mech that has lost both legs: it immediately falls, has only 0 MP, and so on. Four destroyed legs: Automatically falls (if not already prone) and is immobile (see p. 16).