Into the Forest I Go

Lorca is ordered to flee before the Klingons arrive, but disobeys in order to protect the lifeforms on Pahvo and improve the Federation's chances of detecting the cloaked ships. When the Klingons arrive, Tyler and Burnham transport to the Klingon ship and plant sensors that will help create an algorithm for detecting cloaked ships. They find an alive Cornwell hidden with L'Rell, but encountering the latter sends Tyler into shock due to memories he has of her torturing and raping him. Lorca has Stamets make 133 micro-jumps with the spore drive in order to provide a three-dimensional reading of the sensors quickly, while Burnham distracts Kol by challenging him to a fight. The jumps are completed, though not without trauma to Stamets.

Summary from Wikipedia, CC BY-SA 4.0.