He overcame his fear of fighting... and did it in prison!
Sylvester had to go undercover as a prisoner—solo—because the team needed to deploy his eidetic memory. While the rest of Team Scorpion fed him instructions via a hidden earpiece, the human calculator braved the prison in order to find secret documents. While the team originally believed the files were hidden in the library, they quickly realized they were hidden in the infirmary.
Gaining access to that area required more than a library card. Sylvester had to pick a fight with the biggest, toughest prisoner in the yard. Toby instructed him on what to say to get the giant convict to draw blood, but Sylvester took it a step further by blowing his nose on the prisoner's gang colors. Needless to say, the brave brainiac earned himself a ticket to the infirmary.