Talking of having blinkers on, Derry didn't save us from relegation, he had over half a season to guide a very strong team away from relegation and a decent manager would have had that squad mid table, he somehow managed to dragg it out till the final day and then managed to relegate us the season after.
Brisley's tackle was one footed and late, that's a yellow card, you can see as much in the highlights, had he gone in the same way two footed I would agree it was a red card, but he didn't therefore it was a yellow card foul.
As for Nolan "only getting a talking to", you're making out like he headbutted Derry and ignoring the fact that Derry did exactly the same as him only putting more effort into it. You might get sacked for it if you're a nursery teacher but it was a nothing incident, both managers did the same thing, neither of them were close to making contact and both deserved nothing more than a warning.