Tess, you invite yourself to an acs attack, and then send a probe to join the fleet to slow it down to try to prevent a ninja so you can safety probe. The trick is, now, that you can’t slow your fleet down by more than 30% or something like that. So you have to time when you safety probe. If you’re attacking a planet, anywhere inside 20min left is good cuz they can’t time it closer than that at all ever. If you’re attacking a moon…you might be screwed. I hope that helps.
Ahh, I’m glad I asked here, Vic told me to leave it until there’s only 2-3 minutes left, and it wouldn’t always let me do it – probably leaving it waaayyy too late, I’ll try and do it a bit sooner, see if if works 🙂