Blood Weapon Issue

[Acidblood]

Acutally that sounds more like a broken Delirium

I don't think it is broken, but I have noticed that you now seem to able to use procs (such as Delirium) right up until the last fraction of a second... which may have been a QoL change going into 5.0, as I don't remember being able to do this in 4.X (but maybe I just wasn't paying attention).

As for why Delirium works and Blood Weapon doesn't... It could be as simple as Delirium being a 'proc' vs. Blood Weapon being 'on-hit'; i.e. Delirium is 'checked' as you press the button (all good) whereas Blood Weapon is only 'checked' when the attack hits, which is possibly a fraction of a second later and by which point it has expired. This is just conjecture though, I have no idea how their engine actually works.