Hookline has a hundred foot long cable with a hook on the end that he telekinetically controls. Only he can control or influence it. It could be described as an All-or-nothing ability, as the cable cannot be broken or damaged.
Hookline is capable of moving people around with his chain, by having teammates balance on top as he moves the chain around.
↑But Hookline [...], a mask that was just chain wound around their face, with spaces for the eyes and mouth to peek through. - Excerpt from Blinding 11.11
↑“He’s in the company of Hookline. Minor mover, has a hundred-foot long cable he telekinetically controls. It can’t be broken or damaged, short of some very select powers, and it will shake off or slip free of a lot of things that would snag or impede another weapon. Frost, hands that try to grab it. So don’t try. It moves faster and acts like a whip, so be super careful if a fight happens. There’s a hook on the end, and he’s most dangerous if you’re at or just inside that hundred foot limit of his range where the hook is flying around. Which brings me to my next point.”
“They’re willing to hurt people?” Houndstooth asked.
“Kitchen Sink and Hookline are. They’re part of one clique in Cedar Point that’s more violent than the others. Aggressive, violent, even borderline bloody. They might be acting as enforcers for others.”- Shade 4.5
↑Gibbet hopped up onto the hook itself, swayed a second for balance, and then found her position. The hook started to retreat back up toward me, carrying her. - Excerpt from From Within 16.4
↑Another silver blade flipped end over end as it whipped through the air. Foil, a chain around her neck, hands trying to keep it from tightening, flipped backward, feet at Hookline’s stomach. Flipping him up and into the way.
The silver blade grazed him. Foil kicked him backward, sending him crashing down to the road. The silver lines that marked bicep, deltoid, and pectoral split, and blood gushed out.