Ajax got screwed so, so, so hard here tonight.
Blind was blatantly fouled before he got up. The foul was the reason he didn't get to the ball before Abraham.
Then once the referee determined Blind was getting a foul he is supposed to immediately stop play to issue the second red unless there's a clear goal scoring opportunity (which isn't a player being out wide with 2 between him and the goal). Instead he let it go on.
Then VAR gave an absolutely BS penalty and second yellow for a handball that's absolutely not a handball because his hand is absolutely by his side.