The bridge is on the edge of collapse and the crystal is surprisingly heavy, so in order for you and Otto to both make it across safely you decide you must drop the crystal over the edge of the bridge to lighten the load.
“Nooooo! What have you done!?” shouts Otto.
“I had to, we wouldn’t have both made it across if I hadn’t” you reply.
You both quickly make it across to the other side of the bridge safely. You then look back and see the ogres coming out from the tunnel on the other side of the bridge…