Does anyone know the history of this interpenetration rule? I would assume that it is for WOR battles... Has anyone ever had this happen? Finally, are there any sources that describe a bow vs bill encounter?
I have always been completely baffled by this rule, especially given PB's fixation with brevity. Baldes through blades or spears I can understand as a reference to Camillan and Polybian Romans, but blade through blade never happens in DBA since all it does is cost a PIP. Blades through spears might have a point if menaced by mounted, but I have never, ever, seen it. Like you, I presume pikes through blades is a mediaeval thing, but why? Have you ever seen pikes recoil through blades? Why would one set up such a situation? What difference does it make if psiloi push back other psiloi rather than interpenetrating them? I initially thought it had disappeared (not being in the recoiling section), but no, it is still there in the interpenetration section.