Every Mei knows the panic of running out ammo just as they finally freeze their enemy. Starting the reload animation just as icicles form on the enemy's forehead means a fight that should be a win is still in danger.
While pushing from Paris point A to point B, Snigfigery catches the enemy Mei before they can flee. The two start dueling and Snigfigery comes out on top, freezing the other Mei. But with no ammo left in their blaster they rush to reload as the enemy Mei thaws.
Just as the freeze is about to wear off, Snigfigery's teammate Wrecking Ball crashes down from above and obliterates the enemy Mei before they can fire another shot.