Everyone knows Pakistan is unpredictable but you can clearly see in this match they need to chase a small target and have the full 5th day to do it. At the moment they only need 86 runs and they have 51 overs in hand. They have lost 5 wickets which can be a little concerning but I think it doesn't matter at this stage. Mind you they are also playing in their homeground and are aware of the conditions.
That's why I said they are unpredictable and always bet wisely when Pakistan is playing.
Anyways its historic test, on day one record number of runs were scored. England taking the risk by declaring there innings and giving a target of 344 runs.