They followed.

They could not run so fast as I did, and so I gained on them rapidly, still shouting to Agnew.

But there was no response.

I ran backward and forward, crossing and recrossing, doubling and turning, pursued all the time by the savages.
At last, in rage and despair, I fired upon them, and one of them fell.
But, to my dismay, the others did not seem to care one whit; they did not stop for one moment, but pursued as before.
My situation was now plain in all its truth.

They had enticed Agnew away; they had attacked him.