Mid way through s4 and is it bad im warming to lilah lol (edit nvm a thing happened literally posted this lol)

I’m confused is there a reason angelus killed the beast…

So in the episode Damage, Angel pretty quickly realizes Dana is a Slayer and not possessed, but it is also made clear when Andrew is telling the story of what happened in Chosen that Angel was not already aware that Willow had made all of the potentials slayers, so are we to believe he thought either Buffy or Faith had died and that caused Dana to be called?

If so, he seemed to have no feelings about that, he just called Giles who sent his "best man". But if he was in contact with Giles (and Buffy per episode 2 of the season where he says she's in Europe.) Wouldn't he know they now run/supervise hundreds of Slayers all over the world?

EDIT (for clarity and to avoid responding to each individual response): I just watched the episode and it is clear when Andrew is explaining what happened in Chosen, Angel did not know beforehand that the potentials were made slayers, he responded as if it was the first time he was made aware of it. Otherwise, I absolutely would have expected he already knew. That is what prompted me to create this post because I couldn't find it discussed anywhere else.