I’ve thought this for a while, but Victor really does have a good handle on his temper.
You can tell he gets peeved, but he never once loses his cool. Twice with Yuuri, we’ve seen Victor with a decent reason to be a little cross. Instead, he responds cheerfully. We see him act in a similar manner with Yakov, who is not very kind in his words to Victor but still receives kindness in return. Even when Yurio kicks him in the back repeatedly (ouch!), Victor does not immediately lose it.
Until Yurio starts running his mouth about Yuuri and then…
Like. Victor’s hand is SHAKING in this scene. He is PISSED.