Lock and Load: The Reassembled Machinist Guide

[Myon88]

Feint is a weaponskill and not an off-global cooldown ability, so you wouldn't be able to fire it in the position Blank is in, between weaponskills like that.

If you did try to fire Feint at that position, what would happen is you would spend the backswing of Split Shot doing nothing (because the game will only allow you to fire abilities off while weaponskill GCDs are resolving). And it would look something like this,

...
Split, (you're spamming Feint but nothing comes out)
Feint
Clean
(Wildfire explodes at the same time as normal, except there's no time for the Slug because Feint used up one weaponskill slot in the wildfire sequence)

And since it is a weaponskill, it means that in practically any situation where you can use Feint, you may as well fire Split/Slug/Clean Shot instead since those have higher potency and trigger procs. It does have uses, just very niche ones, mainly for when you want the slow debuff, or when you have to fire a weaponskill on the move and you can't/don't want to drop Gauss Barrel for some reason.