Yippee, well done Arsenal, brainfart rubbishness.
Should be a red as from what I could see the guy in the middle of the partk was a Palace player who was faster than everyone else so he could pass that in to a Palace player through on goal.
To be fair the contact was more accidental than absolutely on purpose, it wasn't cynical but ultimately still took him down and cost a goal scoring chance. But the position we let an ultimately really quite slow striker to get into, was the brainfart part of it, not so much Arteta.