I think the Spurs keeper just screwed up - Alto....was unsure what to do with the ball coming in so high - he hesitated, and still had both feet on the ground (no contact) when Vokes was up and readying himself to head it - and Lloris was still upright and unhindered when the ball was on it's way into the net - then for no apparent reason...he fell backward into the goal.
Again, contact, if any, was minimal....and Lioris didn't commit....his fault, and we can't blame Vokes for going for it - that's his job - but up against these teams with big names....is naughty to forget ourselves - if we dont bow in deference....their 12th man will be called upon to help, as dont want us F@cking up the illusion.
;D