Well, make an experiment.
Enter toribash, and on classic settings make noobclap, you know, contract 2 pecs. Press space once. Lower shoulders. Press space. Woah, he lost triceps'
Now: Do noobclap, press space. Lower shoulders, press shift+space 10 times. WTF, nothing?
If you are too lazy for that take a look at replays. Damage in 1st one is just 10k bigger than in 2nd. I think it's bonus for ripping triceps'.
Lmao, i cant see logical solving for it.