1) There seems to be idk a bug or a feature that in some cases it will actually apply the protect and/or stoneskin to people that are still being loaded in at times. Doesn't work on all but seen it often enough. Also most CSs aren't too long so hard casting a stoneskin II when loaded in usually makes te go off just as the last person leaves the CS and Duty Commences. If my co-heal or a paladin cast protect while I'm casting stoneskin 2 it's just that much nicer and faster. Can always cast a stoneskin on a stragler or two.

2) My reaction to one or two people taking not too much damage and not expecting any serious damage tends to be regen and forget them.

3) I will generally try and pop a swift res on my co-healer or anyone the first time it happens - or if I trust them(i.e. we know each other either pre made or just luck of the queue). But after the first time I will have to consider MP regen and other stuff.