Judges 3:26

‘ And Ehud escaped while they delayed, and passed beyond the graven images, and escaped to Seirah.'

The delay gave Ehud time to escape and he again came to the graven images, and then escaped into Seirah, a place of which the details are unknown to us, but it was presumably in the hill country of Ephraim.

And it is now that we discover the full detail of Ehud's plan. For he had already made arrangements with the tribal confederacy, who had gathered and were awaiting his signal.