Tbh I think they expected their customary (against us at least) entitlement to possession from the ref:
1) ping it around
2) get tackled
3) fall over
4) get the ball back
5) repeat until we can't press them at all
They realised they'd actually have to play a bit in the second half, by which point the home crowd was up
No matter what, one thing that never changes with Arsenal, the amount of whinging they do. I was talking to an Arsenal fan in the chippy after the game yesterday, and I mentioned the whinging at every decision that goes again them, he actually said it was embarrassing.