Did Zayn injure his ankle with Justin?

One Direction's Zayn Malik was spotted hobbling along on crutches with a sprained ankle on his way to a flight at LAX airport after the MTV's VMA's but what really happened and was Justin Bieber involved?! "We were skateboarding and Alfredo Flores and Zayn were at my house before I got there, " Justin says. "Zayn rolled his ankle on the half pipe. I felt bad." Fortunately, it wasn't Justin's fault, and a few days later Zayn tweeted, "Hey guys, just to let you all know I'm all good, no need to worry."