No, you should not be concerned. This might barely be considered a sub-concussive impact. It would be a concern if you did it 100 more times.

I think you meant to say a 19 pound band. That is the most common heaviest resistance band.

As your considered, this was just one of life's many bumps.

A bit of skin soreness at the impact site would be expected.

Be grateful you were looking away. It could have messed up your face.

Have you considered using TRX style equipment instead ? They do not have the risk of snapping.