I had exactly the same thing a few years back, on the middle of 109, people stood in front and to the sides of me, no problem I thought until the showsec arsehole at the front kept giving me the eyes and mouthing sit down at me, I was hardly going to sit as being a 5'7 lad i'm gonna see nothing...
Half way through first half he pushes past half a row of people telling me he will knock me out and get me banned so I just laughed at him whilst getting pulled all over, then a lad in the row in front told him to pick on someone his own size to which the absolute prick radio'd and got the coppers down to drag him out.
We then argued as he was telling me and the lads to the side of me to sit but didn't grasp the fact he was blocking our view, eventually his colleague came and pulled him away as he realised what a nob he was being but I moved after a few other similar incidents.