3 N00b questions - with answers

[WSzaboPeter]

Greetings,
I beg your pardon, but I got two newbie questions.
First: what happens if I get quickness on a unit with a weapon heaving 2 or even 3 attacks (like Wave Breaker)?
Second: Manual of Water Breathing is listed in the manual as Water breathing 50, but the in-game descriptions sais 25.
Third: If something has water breathing x (like 25), can I use it to send 23 rank-and-file models and 2 commanders underwater. Or if I give it to a commander does the commander count in the number? (Example: I give the manual of water breathing to a commander and I give him 25 troops. Will they submerge?)

Thanks a lot for answers.