This was very embarrassing defeat for Arsenal, even Arteta seemed unable to believe his team lost to Bournemouth, this is one example that Arsenal is not team that has champion mentality because when something bad happens like player getting red card and only playing with 10 players it can destroy their confidence.
I chose two matches this time by making Tottenham and Arsenal as favorites, Tottenham managed to win but Arsenal made the betting slip defeat.
But Arterta was the genesis of their own defeat by the way. He has no reason to be surprised with the end result. He doesn't necessarily need to defend all when playing with ten men against eleven. Why not play three at back and continue with his game? Pep, his master never succumb in games like this. In fact, he used to substitute a forward even when City is down and end up winning the game at times. Resorting to defend will only bring more pressure that they can not withstand and one out of two will definitely happen, either the opponent score or you concede a penalty. He should have a reflect as well to Liverpool against Spur last season when Liverpool was down with two red cards.
By the way, Arsenal players are getting use to conceding unnecessary red cards. They have lost important points because of red cards that can be avoided. Arterta need to speak about with them because it is obvious he didn't care about their conduct on pitch because if he did, they won't be repeating same mistake over and over again. You can not be a champion when you are getting red card in every match week for silly decisions.