What power head for rotary scissors?

Fiskars Rotary Cutter 3-Piece Set - 45mm Stick Rotary Cutter for Fabric, Cutting Mat, and Sewing Ruler - Craft Supplies - Gray

Training on some techniques for rotary saw work in low visibility. Focusing on keeping high rpm's low to the floor (where the cleaner air usually is) and then moving up and cutting and then back down again when the smoke starts to "choke" the saw out and then ramping the rpm's back up and getting back to work. Also working on utilizing an scba cylinder to feed clean air into the saw's air intake. This takes coordination and practice (under ideal conditions) to ensure both the sawyer and the air