They can only jump on the empty and elevated platform..the energy is transferred to the other platform lifting the guy/guys standing on it to the higher floor.
As an example: 4 steps on right platform ..one from 5th floor jumps down to the left platform. The result: 4 guys are raised on the 2nd floor,say they lean to
be able to step on the edge of 2nd floor....while the jumper landed on the 1st floor without a rebound.
The guys on the 2nd floor can jump down too.