I wouldn't be too concerned. I think that's kind of job hazard for groomers. If a dog was put down every time it bit a vet or groomer or whatever, there likely would be very few dogs left.
What did the groomer do?
Apparently she picked up a paw with a pretty big bump on it (Which I informed her was there and he was touchy about) and he had at it. Otherwise he was an angel throughout his grooming which actually really surprises me as he hates baths and the clipper noise.