I think you're misjudging the altitude and speed of the rocket. In no way will Tomaru be able to land on the other platform before the rocket hits. 

Distance between Tomaru and the other platform: 44 feet (edge) or 59 feet (middle)
Distance between Hitler Rocket and Tomaru: 25 feet. 

Rocket speed: Likely a lot faster than the unspecified dashing speed capabilities of Tomaru. 

Altitude: Fuchsia hits the ground before the rocket lands it's mark, meaning he's not that high up to begin with. You're allowed to assume at which altitude he's going at, but by logic, it's the opposite of what you thought ^_^