Do Runes of Hagarrad/Kalastor only fire once per cast? Or are they like turrets

See title.

You place the runes, they need 1,5 seconds to arm, after that they go off when a enemy walks over or are close by to it.

the rune of kalastor however has a small “explosion” when you cast it on the ground to stun enemies (it also needs 1.5 seconds to arm) and will go of when a enemy walks over or are close by to it.

hope this explains it?

Like Arcane Bomb devotion skill ?

yep

10/char