Aksai's Scarecrow puppets struck fear into the hearts of both his enemies and allies as they were effectively utilized in battle.
He also dispatched some of his Scarecrow puppets to guard the palace entrance. Consequently, those who attempted to flee after Lin Sahu's defeat met their demise.
The martial artists of the Temple of Guardian realized too late that they had been lured into Everwood Palace by Aksai's strategy. It was akin to entering a purgatory from which escape seemed impossible, at least while they remained alive.
Aksai and his Scarecrow puppets launched a vicious attack for a reason. The Spirit farmer aimed to instill fear in his allies, ensuring they never thought about betraying him ever again.
Aksai employed fear as a tool of psychological control to keep his allies in check. Just like what Lin Sahu had done, albeit in a better way than her to some extent.
Do not let what you cannot do interfere with what you can do.