This is an overuse case in my opinion. When forced, the body will react sometimes violently. When he slightly hyper-extended his left knee, it changes his gait(the way he normally looks while walking or running). You can tell he was labored. 17 Seasons in, you have to ALLOW a rest. No one is superhuman.
The last prominent LA Athlete to go down with a completely ruptured tendon was David Beckham. His story offers a unique perspective of why an achilles can go and how to treat the rupture.
His surgeon is one of the world's best and he had Beckham back and playing in 4 months.
http://www.guardian.co.uk/football/2...ld-cup-england
This 2nd link shows what a complete tear looks like. It ain't pretty. You've been warned.
http://www.dailymail.co.uk/tvshowbiz...lles-heel.html