After barely defeating Lawrence Barrett I had resolved to pack a lethal weapon for future bosses. However I sold everything except for my tranquilizer rifle and my P.E.P.S. somewhere along the way, including the almighty rocket launcher I stole from the D.R.B. Now I'm stuck with the aforementioned weapons, a single gas grenade, a single EMP, and plenty of energy restoratives. What do I do here?