From the sand fall, quickly get onto the left platform to prevent the right side Evir from lowering too far. Freeze the right Evir, then jump on the sand to the right while shooting ice over the first Evir to also freeze the second. Freezing the first Evir very high up would also work. As a backup, it may be possible to make them rise again by hitting them with a PB - place the PB in the air to avoid double hitting and killing them.