When used, Scorch will use his hand to create a shield out of fire, similar to the Vortex Shield. It will stop incoming fire, and will damage enemies that get too close. It does a lot of damage, killing pilots almost instantly, and does a lot of damage against titans.
Trap an enemy into a corner with Heat Shield, then deploy Incendiary Traps (this can be done while still using Heat Shield) and light it on fire, dealing massive damage and probably destroying the titan.
Use it to kill pilots that have grappled onto you.