GAS: Montage blending out - what does it mean?

I can’t get when this node is activated

What does blending out even mean?

On Completed: when montage succesfully plays
On Interrupted: when another montage is starting to play on mesh, in the same ability or in another ability
On Cancelled: when this ability is cancelled
On Blend out: when?

Why am I getting blend out instead of completion? It’s a server initiated ability, that doesn’t replicate and is activated by a gameplay event. I don’t think there are any other abilities that try to run during its activation, but I am not 100% sure, as GAS debugger shows a lot of them same time and doesn’t show activation log.

Ok, I guess it’s fine for montages to blend out instead of completing because of this setting

So I can just treat blending out as completion, because attempt to play another montage will cause interrupt, not blend out.