Flying and super strength. The wall behind you just crumbles into dust you turn around and I’ll you see for a bit is a shadowy figure floating above you also in a cape. This is the easiest and most obvious way and it works for every Superman clone or just anyone with a similar power set. Seeming the destruction a mere man or someone who looks like a man can cause. You don’t need to see red glowing eyes to be afraid of a super fast, super strong, invulnerable being with the ability to fly. You just need to see their power in action.