I think the first question you have to ask yourselves is "What would the penalty have been if an NPC had done that?"
Once you've established the normal penalty, only then can you move on.
You never said what the other members of the group did during the fight. Just sitting back and watching someone slaughter the town guard isn't likely to sit well with the local law.
As for the stabilization checks, if I were a guard I would definately learn just enough first aid to handle such a situation. I think it is quite reasonable for guards and anyone who might not have access to a healer to learn a little first aid. Give them a first aid check with minimal training. They will probably get it right before the person dies.
Frontier justice tends to be a lot more flexible, especially since there is always some sort of problem that the towns just don't have time to deal with. You need to punish both Flail boy and Mr. Lippy. A clever judge may just penalize the whole group and allow the other members of the group to punish Mr. Lippy. He is the one who got the rest of them into the mess. Maybe next time they will interfere before another character gets the whole group into a mess.
I do like the idea of a hanging and giving the bodies back to the companions. This is especially interesting if the group might not decide to have their friend raised because it is too expensive. Branding is also a good idea, and allows for any number of adventure hooks. Any time someone has a dodgy proposition, they are going to look for an outlaw to carry it out.
What does the town need? Is there anything that the group can offer that the town can't or doesn't want to do?
If there is no reason to let the characters off, go with the double hanging, marking them as outlaws, and allow the companions to pick up the bodies.
Once you've established the normal penalty, only then can you move on.
You never said what the other members of the group did during the fight. Just sitting back and watching someone slaughter the town guard isn't likely to sit well with the local law.
As for the stabilization checks, if I were a guard I would definately learn just enough first aid to handle such a situation. I think it is quite reasonable for guards and anyone who might not have access to a healer to learn a little first aid. Give them a first aid check with minimal training. They will probably get it right before the person dies.
Frontier justice tends to be a lot more flexible, especially since there is always some sort of problem that the towns just don't have time to deal with. You need to punish both Flail boy and Mr. Lippy. A clever judge may just penalize the whole group and allow the other members of the group to punish Mr. Lippy. He is the one who got the rest of them into the mess. Maybe next time they will interfere before another character gets the whole group into a mess.
I do like the idea of a hanging and giving the bodies back to the companions. This is especially interesting if the group might not decide to have their friend raised because it is too expensive. Branding is also a good idea, and allows for any number of adventure hooks. Any time someone has a dodgy proposition, they are going to look for an outlaw to carry it out.
What does the town need? Is there anything that the group can offer that the town can't or doesn't want to do?
If there is no reason to let the characters off, go with the double hanging, marking them as outlaws, and allow the companions to pick up the bodies.