"Key grip" nghĩa là gì?

“Initially, Phil suggested it could be done on Steadicam or perhaps with moving set walls,” says Lloyd. “I worked with Loren and Jimmy to devise another option: build a very rigid set with a scaffolding (dàn giáo) shelf, reinforced by water drums, and on top an I-beam bridge with a rail dolly system that held A-dolly grip Dan Beaman and a Fisher 10 dolly. The ceiling had a 1-foot channel for an underslung Epic on a Mini Libra head. Rigging key grip Dave McAllister engineered the scaffolding system that supported the set and Jimmy built the I-beams spanning the set, enabling the dolly to roll overhead on an offset riser. High-tension wire was added to reinforce the walls and prevent any flexing or wobbling as the dolly maneuvered above the action.”