Parked on a remote? They can't be that worried about anything catastrophic taking place on the ground then?
I'd assumed they'd leave it on the turning circle at the end of 24L if they were?
Lots of footage on Sky News taken from inside the aircraft with a Typhoon alongside, makes me think they're not worried about passengers remotely doing anything using phones/tablets etc?
Storm in a teacup? Good QRA response practice.