The Blood Tube- by eriknyc Objective: Enter the enemy base and make your way to the back of the lower level where their flag resides. Grab it and bring it back to the capture point on the upper level/roof of your base. Scoring: 10 points per Cap. This is a revised version (by the original author) of the TFC map 'btube' from Gearbox Software's HL expansion pack "Opposing Force".