Commentary
Here the priest's special longpoint is besieging quarta custodia. This possibly happened because the scholar was using priest's special longpoint to close in the grappling distance, and the priest saved himself by retreating into quarta custodia.
This is a situation with unclear initiative. If the priest is faster, he will strike with halpschilt, and it will lead to the play 29 or play 30. If the scholar is faster, we will thrust low. This is will go generally the same way as the previous play, which is also said in the text.