however, her punches 'did no damage' despite their power

“Nn!!”
With a shout far too cute for a widow in mourning clothes, a shockwave-like roar rang out.
“I never knew there was such a safe and simple method of measuring the strength of my
punch. This was a complete blind spot for me.”
She was in one corner of an arcade that felt like it was about to close up for the night. The
giant punching machine’s earthquake-resistant bolts had broken and it wobbled
unsteadily. The gamers had been glued to a Youkai battle game where a Zashiki Warashi,
a Yuki Onna, and such grabbed at each other’s hair and punched each other (and was
providing seasonal SSR Christmas costumes from the card vendor), but their attention
began to gather on the party games that had been driven into a back corner.
That fist had knocked down Academy City’s #1 not long before.
As she beat all the high scores in quick succession, the part-time worker grew pale because
he had been gradually increasing his score using the cleanup time after closing. Mina
would slam her entire body forward, so her upper body would lean up onto the machine
when she hit. That caused the skirt of her mourning clothes to ride up quite a bit, but she
showed no sign of caring.
Leaning against the wall nearby, a white-haired, red-eyed monster with a modern design
cane clicked his tongue.
“I see. So this is what it feels like to work up a sweat. Fascinating.”
“Does this mean you really did get involved in all this without knowing a damn thing that
was going on?”
“More or less.”
Anyone who knew the legends of the #1 would have pissed themselves, but Mina Mathers
had not been torn to pieces. In fact, it had been Accelerator who first demanded they stop
their no-rules street fight. The black cat witch’s fist could never do any real damage, but
she kept dodging just out of the way, preventing the #1 from getting in a finishing blow.
In other words, it was an endless stalemate. Since his choker only had so much battery
power, that was not an amusing situation for Accelerator.

- New Testament Volume 19 Chapter 1 Part 9