There was a drone crash at a marathon race in Australia where the drone was being used for filming and it came down on a competitor.
https://au.news.yahoo.com/thewest/re...rone-incident/
So yeah if you sneak up on the pilot and hose him down will he spasm and fly into someone? Will the drone have a hard deck programed in that it can't fly under if even if commanded?
Probably within a few years this will become reality.