PCB - stealth attacks

[Fnord]

Specifically asking about ninjas, but also rogues and probably others.

Does the damage bonus apply to the first hit with the first weapon? First set of blows with the first weapon? Or both weapons?

[CyclopsSlayer]

It is common while early dual wielding to see the Surprise Attack message, then miss, miss, or even backstab.
I have always assumed, no code basis, it is first attack only.

[Fnord]

Since I've seen multiple of "critical/fatal injury" in a single round of combat on two different weapons, I'm going to assume it works for the whole move. Of course, subject to code diving corrections!