A video from Paktika, Afghanistan shows infantry mortarmen firing 60mm high explosive rounds in handheld configuration during a steady rainfall.

For whatever reason, possibly the rain fouling the charges or the tube being too wet, a "short round" occurs that only lands a few meters in front of the mortar team. As per standard operating procedure, they rapidly vacate the area to a safe distance in case the round detonates, before returning to deal with the UXO.