Nitro boots and defile

I have seen that sometimes using nitro boots AFTER you got targetted will drop the defile onto the position you initially used the boots. Happened to a guy on friday on our third run, happened to me on saturday on fourth run and yesterday on a bane I got to test it properly and it gets dropped right on the spot you used them instead of where you are when the cast just ended ( Note that if you use them before you are getting targetted you won't have any problem with the defile). This kind of things didn't used to happen ( at least 1 month ago) and ends up punishing players that are decent enough to react and use boots after you got targetted instead of just pre-use them and waste in case you didn't got the defile. Can anyone explain why is this happening? By the way, blink, disengage, sprint are working perfectly, the only thing I've found as a problem is this specific use of the nitro boots.