I don't think refereeing cost us* Poor defending cost us the 2nd goal and if we'd been a bit more clinical we could have been 4 up at half time.
As Robinson said in his post-match, we did the exact opposite of what he asked in the first 15 mins of the second half.
If we can learn from that, we have a shown that we are capable of beating all 3 teams left in the Cup. Top 6 is gone, but that is 100% due to our dip in form before the break than any points we dropped over the past few weeks.
*Not that I'm defending the ref. We can't control that, though - we can control the way we started the 2nd half. Like Robinson also mentioned, it's easy to forget we have a lot of youngsters in the team that are still learning the game.