A very clever scenario involving parry, mid-air blade-inversion, and the deadly pommel-strike called Mordhau (murder-strike). Similarly called Mortschlag, or alternatively, Donnerschlag (thunder-strike) as per Master Talhoffer (1467).
Half-swording (Halbes Schwert / Kurzes Schwert) calls for the fencer to grip his/her longsword with one hand at the handle and the other hand shifted to the blade (or even both hands) to wield it somewhat like a spear, pollaxe, or mace, whether for defence or offence.
Half-swording was used mostly for Harnischfechten ( harness fighting = armoured fencing ), although it could be useful at times for Bloszfechten ( bare fighting"" = unarmoured fencing ), and should thus be part of ones fencing repertoire.
to watch this video and see this technique explained in detail