I also generally agree with what Spice said, but at the end of the day game management and timekeeping are very important, and adding just 6 minutes on was a complete joke.
Until referees add time on for time wasting, unsporting behaviour, injuries, (feigned injuries), substitutions etc, then teams will continue to waste time.
We've paid to see 90 minutes football. That second half was so disrupted that 10 minutes added on would not have been unreasonable.
There was the best part of 3 minutes when Pedro went down near the away dug out and a few subs came on, then we had the 3 delays caused by the Barnes stuff in the box, the El Dakhil incident, the other substitutions etc. etc.
I think that there is a good chance that we would have won that game had we played another 5 minutes. Having said that our performance was probably worse than the referees (in general).