short strangle hold theory

I dont know if other noticed the agressive selling yesterday, I was hoping for some comments. I thought it was agressive and then it held very well...

This morning I see the reported short position decreased by nearly 500,000 so my theory is that the short was pounding the shares, flushing out weak sellers and then buying up just enough to reduce his position and not increase the value of BNB too much.. hats off to the trader if this was the case because the SP didnt really move yesterday in line with the market sector or with the fact that 16% of the shorts were covered....

Any other theory? How do we make the shorter pay?