Thank you all so much for your incredibly kind words!
As many of you know, #Hysteria was the bonus song for the 50-song challenge, and I already got a medal for smashing those 50 songs – woohoo! 
That said, I actually agree this song deserves a T-shirt, so maybe I should order one from @JoshFossgreen.
It seems my fingers were indeed flying on both hands! This was my first and only take at full speed, so I think I was truly maxing out my abilities at that point, haha!