I'm posting this here since I don't know where to post it else, feel free to move it if it's not in the right place.
There is a bug with the thor, when placed directly above an emitter (the emitter I tested it on was 250 creeper every 15 ticks on lvl1 terrain) causing what you can see in the image I attached, I believe it comes from the thor trying to fire directly upwards, even though I have no idea why it would want to do so.
P.S. The emitter was near the corner of the map, however the thor was fully on the map so I don't think that matters.
EDIT: I also attached the map in which I encountered this.
Yeah a little visual glitch when the Thor is exactly over what it is firing at. Will be fixed in the next build.