No damage from punching a mirror

When I pulled my fist back, unbloodied and unscratched, bits and pieces of the mirror came down, too, falling into the sink bowl and clattering as they broke into tinier shards. In the mirror itself, there was an indent the size of my fist about two inches deep, cutting into the wall behind it, and radiating outwards from it was a starburst of missing glass.

I looked down at my arm and my unscathed hand, which had already started to transform into my base Breaker state. The thin layer of golden energy that wrapped around it like the personal shields on the power armor from one of those video games was invisible but for the barely there shimmer as light refracted through it.