I hate this shit god damnit guys.
Never lock the knees, and what the fuck so many fails here. I've lifted that much many times and more than that and when I felt my knees grinding I decided it was too much. My peak was 500kilos.
Dude is fucked, that's not a broken bone, that's a fucked knee and a lifetime of disability. Stupid asshole. God damn dumbshit.