A skier being helped onto a red stretcher by three men, while two other men and a woman prepare to help.
A skier is standing on a blue stretcher while three men watch excitedly
The people are either three men or two men and a woman. Being helped onto a stretcher would mean the skier is lying down.
The red stretcher isn't a blue stretcher. Two men and a woman aren't three men.
The skier cannot be standing on the stretcher if he is being helped onto it.  The stretcher is either red, or blue.  Either three men are watching or two ment and a woman.