15thc perception on swallowtail merlons?

[Koen G]

Nice find, I couldn't find anything myself (lots of German sources also). On the drawing, it's only the little wall in front of the one with the battlements. Theoretically this leaves the option available that the swallowtails already existed on the larger wall before they added the round tower. The 16th century construction of this tower indicates that they were building right at the only spot where the castle has swallowtail merlons though, so it might be best to assume that they belong to this later building phase.