All of sudden, Lingerie lost a large number of her strongest masters while she pinned herself on the spot. The Thorny Flower formation was a strong defensive one without doubt, but like any strong defensive group formation, once activated, their movement was sealed!
If they moved to help, they'd break the formation, instigating strong backlash that none of these masters would want to experience.
In a single move, William didn't just kill lots of strong masters, but he also foiled her plans. Now the far away masters had to stop advancing, arrange their lines, forming groups, which wasted more time.
If they hurried like they were doing right now, then they'd all fall into William's deadly trap. So they had to delay their arrival to safely secure themselves.
At the same time, William managed to buy himself enough time, both for him and other high end masters on his side.
