Hmmm, okey.
I'll try it out and see what happens.
It can be a vanilla bug, but that i'm not able to say much about.
I have tried some testing to figure out they'r range too since it's nothing hinting or stating anything about it.
And it ended up being inconclusive of sorts since the one guard nr. 7 that was placed on top of a 7 tall noob tower were firing shorter than the same guard on top of a 5 tall noob tower.