Yep, half light speed or thereabouts; superhero story :). I'm writing a story about this fellow who gets super powers, including super speed. He can move, fly, at up to 100 000 miles per second. He can also move around at normal speed if he concentrates on what he's doing. Right after he acquired these abilities (he's super strong and invulnerable as well), we find him at an ocean beach at night, sitting on a bench. Thinking his new situation through, so to speak. You know how when you're sitting there, sometimes you take your foot and move it from the ground to your seat, sorta like with your heel on the seat of the bench? Well, the protagonist does this movement but loses his concentration and performs it at half c. IOW, his foot and leg move that fast, 1/2 light speed. He manages to stop before his foot hits the seat when the realization hits him. The way I have it written: the movement causes a hurricane force shock wave to propogate outwards. Behind him on the boardwalk is some partying going on, a Mardi Gras of sorts in a tourist town. But there is this biggish stone and cement bridge structure immediately behind him that focuses the wave away from the crowd and out toward the surf. Fortunately for him. Unbeknownst to him, however, a beachcomber a few hundred yards away is hurled into pier pilings and killed. It's night OK? He didn't notice the lone person in the dark, no xray vision, heh. Other than the superpowered magic, does this seem realistic? Or is the situation even more dire for the MC and his surroundings? Thanks for your help.