Tipping in the service industry

[Aoi Magi]

Feet are gross. While I'm trained to do mani's and pedi's, I won't. I hate feet. Especially other people's feet. 

I'm assuming blood surfaced. The service should have stopped immediately and she should not have paid for it. She could file a complaint against the salon and the worker but I don't know if there's a licensing bureau where you are. Definitely something worth looking into, I think. If you have details from your friend as to how they proceeded to handle the cut, it might be wise to write those details down as a major infraction might have occurred. 

If she's still limping about, she should get to a doctor to have the cut properly cleaned and looked at.

Yeah, she said it bleed quite a lot for a few minutes before slowing down enough for them to bandage it there and send her on her way.
I was absolutely shocked when she told me they still charged her (without even a discount!).  I don't think she means to sue or anything, but I doubt she'll return there for business.  
Thank you for the advice!  I'll pass it on.

Your friend is too much a softy! Just the injury I can understand, but if they are charging on top of it, it clearly shows that they don't feel the least bit sorry and in such cases I'd also not hold back!