Pool of Shadow

Hi Folks, need some explanation about how really works Pool of Shadows spell from Shadow Warrior warband.
"Allows you to Hide" means puts you in hiding mode, allowing you to shoot then cast that spell and puting all your warband in range Hidded?
Or makes more harder to detect your previously hided warriors?

I would handle it like this:
- Place some kind of “shadow” marker next to the spellcaster.
- As long as the marker is there, allies within 6” may hide as per the usual rules with the difference that you don’t need any terrain in order to hide as usual because the “shadow” of the spell provides this.
- Allies within 6” of the marker benefit from cover against shooting (this is irrelevant once the models choose to actually hide in the shadow)
- Remove the marker once an enemy moves within 6” of the marker.
- Remove the marker at the beginning if the Shadow Warriors’ player’s turn.

So you need to declare hiding in your movement phase to get benedit from the bubble?

Elfs inside the pool of shadows can hide immediatly after the mage cast the spell? Or they have to wait until their next movement phase?