Clockwork Probes

[Terraziel]

How are the supposed to behave?

Are they supposed to fly, well slide around, like they occasionally to do in normal gameplay?

or are they supposed to roll along the ground like they seem to do in battlegrounds?

The reason I ask is because they look very strange whilst moving off the ground, but it's hard to judge whether it's a bug or not, because there is nothing in the enemy design that implies one or the other

[x4000]

They are a flying monster.