i poped reaper in plains as normal and was on my way to do pools cuz t2 was slow . i noticed the reaper was taking damage so i get back to the reaper and saw the right rider left his place and was attacking the reaper.and btw i did t3 for more than 200 time and thats was the first time that the rider leave his place here is the pic
EDIT : no need to see cons time cuz at that run t124 failed and we had to tele and rez them and uwg was on so lt had to do it before i can go to plains agin ^^
I would probably say that is unlucky and might happen if u don't have a cupcake up. Just make sure you have up a cupcake next time if you didn't this time and you can also run behind the monument in case the rider does pull a bit far.