What if deku was transferred to was transferred to jjk with cursed energy and hit a black flash with Fajin

So to the people who don’t know what Fajin is it’s a quirk from one for all allowing the use to build up and store kinetic energy and release it in one burst I was wondering if we gave deku A one time black flash on say a Dummy that when hit with his black flash transport Him back to MHA. So I was wonder how the strong a 100% + Fajin + black flash Detroit smash with one for all.