The only thing left for Chelsea to do is play defense against Arsenal, but they are unable to do so because they appear to not care about three points and instead want to stay in that position. Pochettino made a serious mistake by substituting them at that point when they were already winning with two goals.
Actually Chelsea really tried on that there match against Arsenal because considering Arsenal performance and how they played against Manchester city I was thinking they will win Chelsea with 3 goals, but on the contrary Chelsea performance proofs very impressive to have managed to score Arsenal first and second, I was actually surprised by there performance.
So when we talk about defense, actually Chelsea defense was more stronger than Arsenal defense on that match but however Arsenal manages to equalise and draw the game.