Blasting Cone bug that cost us 2 kills, 3 turrets and Baron

I just played a ranked and used the Blasting Cone to get to ally Nasus and help him 2v1 Riven. I went over a wall into the Krug camp. I don't know if I stuck or what, but right after that I couldn't move FOR 20 SECONDS! Enemy team literally managed to come from their fountain and rekt us both, mainly because who unstuck me was Darius with his pull. After that they took Baron and easily took three turrets 5v3. If this isn't an alarming game-breaking bug, Ï don't now what is.