Drone bug with a sledgehammer
The drone can carry friendlies to buildings inaccessible to those without a heli or jet to get to. They are having a friendly jump on it and hit the drone with a sledge hammer causing it to launch in...
Ideas
I also just picked up video evidence. one guy was trying to do it at liberation peak. New Sobek City still appears to have a big issue with rooftops, but I think people are using either assault ladders from one of the building clusters in sector 2 and/or the drone+hammer exploit. I did see people on top of the bridge at Mahatten Bridge in breakthrough today.
It can't be done solo as the drone will get destroyed, but it does give you a slight boost into the air, but I've only tested once.