Mr. Compress once tried to teach Toga sleight of hand because she once saw him shuffling cards and was awed.
But when he did...
"Now, young lady, the art of sleight of hand is about finesse, deception, and most importantly — subtlety."
"Oooh, like sneaking up on someone and slicing their throat?"
"...Not exactly what I was going for, but sure, let’s work with that. Now, observe—"
He pulls a playing card from his sleeve, makes it "disappear", and then dramatically pulls it from behind Toga’s ear.
She claps excitedly. "Do it again! But, like, with a knife!"
"No knives, Toga."
"...Okay, okay, no knives." pulls out a scalpel
"Toga."
His next attempt...
"The key to all magic is misdirection. You draw their attention elsewhere—"
Toga nods. Then, mid-sentence, she throws a knife at Dabi. (It misses, but only because he moves at the last second.)
Dabi: "WHAT THE HELL, TOGA?!"
Toga: giggles "Misdirection!"
Mr Compress: "... Toga."
He gives up.
Toga is thrilled and believes she has mastered sleight of hand.
Dabi is never sitting next to them again.
Twice is the only one genuinely impressed and starts calling Toga "The Murder Magician".
Compress refuses to acknowledge this atrocity as magic.