If you want to describe the spell unfolding in your post, I'll describe it here. However, if you choose to avoid doing that, I recommend not to read it. Freya's reaction might be more genuine then, but I dunno.
The spell will cause the earth itself to rip apart, causing numerous spikes to appear, while the true danger is standing on the way as gravitational forces rip earth apart. The spiky surfaces it creates make this spell rather usable in area denial, which is the actual use for this spell. However, now Harol is aiming away from the rest of the village, not trying to actually strike the attackers. They would have to stand right on the way of the gravitational wave to be harmed, but they should get scared nevertheless.