We all know that Altaïr could do air assassinations long before he described the techniques in his Codex. He didn't think it twice and he saved Al Mualim's life by killing Haras by doing so (Even when the cutscene and the possibility to do a leap of faith before that contradicts this).
And now Bayek can do it as well.
My question is... what did the developers say about this? How did they explain it?
Was it that the Animus had some restrictions to the Animus-user so (s)he could not pass through the Bleeding Effect?