We should just run

Only when the caster is in mortal danger can this spell be cast. When the spell is cast the caster along with any creatures that can hear within 15ft gains the ability to teleport once up to 500ft away in any direction as well as an extra 80ft movement speed for the duration of the spell. The movement and teleportation gained by this spell can only be used to get away from the source of the danger. Moving past enemies does not provoke opportunity attack, and any time an enemy imposes a dexterity saving throw, those under the effects of this spell gain advantage on dexterity saving throws.  To cast the spell the caster has to say "we should just run" the spell fails if the caster can't speak.