Can Gaspode or Wallace Sonky interrupt the Bursar's minion exchange when one swapped minion belongs to the interrupting player?

Question

Accepted Answer

Gaspode can, because the exchange needs two minions, so if one cannot move, the swap cannot happen. Whether Sonky stops the whole effect is less clear.

Discworld: Ankh-Morpork

Can Gaspode or Wallace Sonky interrupt the Bursar's minion exchange when one swapped minion belongs to the interrupting player?