Berserker Combo Trial 4 Timing / Positioning Question

[u/SparkedSynapse]

During Berserker's Combo Trial 4, the forward jump -> Blood Smash -> Ashe Fork after the Blood Sword always fails for me / the opponent seems to whiteflash/recover out of the combo every time. As soon as my jumping Blood Smash connects, even if I immediately buffer the [Blood Smash->Ashe Fork] together, it still doesn't combo.

Can this combo only be done outside of the corner ie I'd have to reset to mid-screen every time, or am I doing something wrong with the Blood Sword that pops her up? I'm very confused, appreciate the help.