I"m not sure spray is the ticket, BUT thinking about it a bit more, maybe if everyone has a small canister attached to them, if the person being attacked could get a squirt in the face... might allow the others to shoot.
Kind of wakes you up... a month ago I was cleaning a moose all by myself in Alaska, at night, done around 1AM.
I thought I was doing all the best I could and evidently it worked out, but something walked up, you could not hear much of anything at all, just muffled... who knows.. but I went over and started the 6 wheeler out in the bush just to be safe. Evidently it worked.
We are not at the top of the food chain in some instances. And some days my mantra of why carry a pistol when you have a rifle... well at least I carry a hell for stout knife ....knife at a bear fight doesn't sound so good though...
