The criminal mind focus's on obtaining what they want sometimes they are not all masterminds in not getting caught. Usually in a group there is one that masterminds the plan and that person's plan is for themselves to not get caught.

I can see a couple options, pippen is being blackmailed or forced to be at the Tower. One is for recon and assess their situation, two he's there to sabatoge another skirmish with the mallers!