Or the wood you are holding with your left hand. I am not gonna start an argument here, [I grew up in a framing business family] when you are cutting bridge blocks and rafter / truss tails, that saw is in one hand.You can hold the guard up by pinching it open with your thumb and fingers, two hands on the saw, pretty tough to cut yourself
I was nursed on the left handed worm drive Skillsaw. I see the blade and the weight of the saw does the work.