You can replenish mana anywhere as a shaman, without resting or fighting etc, once you realise how. If someone is ko'd, you can damn them with 50% of your commands until they wake. Given the length of some ko's, that's a lot of damnations!

Mana really isn't much of an issue. The yells is, but ultimately no one really knows how to handle poison/traps yet, which means the rescuers can easy end up in a similar situation if they are not careful.