[The lightheadedness had started to creep up even before Acumen made its declaration, so she's well aware what the problem is. Perhaps she should have said something.
But now's not the time to. Just as she feels exhaustion weighing him down, and by proxy her, his sudden pain is keenly realized despite not experienced directly-- her reason for being here threatened, their well-being precarious at best now. She no longer has any reason to hold back, no longer her own weariness and how to expend her remaining strength a concern]
Strike Air!
[Upon thrusting her blade at the advancing sentinels, an immense blast that far surpasses the sound of her shout is released-- her brilliantly golden sword finally exposed as the previously compressed air around it is fully unleashed in a brutal, high pressure torrent that completely clears the immediate area in front of her Master]