Rikers bus drivers are in a unique position to prevent a witness imprisoned on the island from testifying against two members of their union accused of beating him: They’re simply refusing to transport prisoners to court. Ostensibly, the work stoppage among the drivers is over bus safety issues, but it also happens to correspond with the scheduled testimony of one Dapree Peterson, in whose beating two Rikers correctional officers face assault and misconduct charges. Hard to see what the end game is here, though.