All it takes is one grenade, one mortar, one shot from a tank that does enough hp damage to start the deathloop. Retreat or not.
You think just moving it normaly under fire makes it so that the deathloop doesnt happen?
And the above can as likely wipe the 4 man squad. Loosing 3 men on a MG42 and forcing a retreat is a worse situation than losing 3 men with a maxim and forcing a retreat. If a model dies on the retreating maxim, it might get stuck in the deathloop and the unit may die. If a model dies on the retreating MG42, the unit will die.