This is a continuation of my talk last quarter on Sharp Matrix Concentration. In this talk, I will give a proof for a special case of the main result. The proof consists of two parts. The linear algebra part is on a quantitative estimate about noncommutativity. The other part involves combinatorics. If time permits, I will briefly talk about the analytic proof of the main result that works in general. Paper: https://arxiv.org/abs/2104.02662