pouring chakra

As if urging him to explain, Itachi stayed silent, and continued to stare at
his friend’s strange sharingan.
“For the visual jutsu of a normal sharingan, your gaze has to intersect with
the gaze of your intended target to some degree. You need that direct action,
and the flow of chakra. But the Mangekyo sharingan allows me to sidestep all
that a bit. I just have to look at my target’s eyes, and I can pour my chakra in,
even if our gazes aren’t intersecting. And the amount of chakra is several
times more than with normal sharingan. So the target falls into the visual
jutsu instantly. They have no idea anything’s even happened.”
“So you mean by the time the enemy sees you, they’re already in the
jutsu?”
“That’s it exactly.”
“And you’re going to use that on my father?”
Shisui nodded forcefully. “If I can just get him in Kotoamatsukami, I can
make Lord Fugaku tell everyone the coup is off. And I can make Fugaku
himself believe from the bottom of his heart that it was his own idea.”

Book of Dark Night Chapter 5 Part 4