Quest - Free Shank From His Prison Cell
Quest Pickup - Tixa Prison (D15 Map2)(Dynamo) or (Shank)
Quest Location - Tixa Prison (D15 Map2)
Quest Finish Point - Tixa Prison (D15 Map2)
If you open his cell, talk to him, viola, you have freed him. Talk to him again, and he will join you. If you talk to Dynamo first, he will give you the quest then follow the above.