xbleed start during push back
Not to mention and pax boarding or disembarking in the jet blast path getting pebble dashed.as mentioned,far too dangerous, even for the biggest tug, or most experienced driver. Always straight down the taxi way, engine towards blast screen, and tug/tow bar disconnected (maybe chock in front of nose wheel) prior to over idling running engine.i suppose it does depend on airport rules though