The obvious one is that he sees killing the detective as a way of covering his tracks, ensuring his escape.

Even his brisk pace and choice of less well used exits, however, was not enough to ensure his unhindered escape.

She has also captured Emma and uses her as a hostage to ensure her escape.

Balliol's party had gained enough of a start to almost ensure their escape.

Armiger tried not to think about their fate, or that of the men on the battlements who were fighting and dying to ensure his escape.

Joe acts as a hero during the fight, rescuing his wounded Captain and ensuring their escape.

In the manga, he sacrifices himself to ensure Excel's escape during their infiltration mission.

To gain time, to avoid later recognition, to ensure their escape.

Destruction of the ship will merely ensure our escape.

Theoden says Yes - that will at least ensure Gandalf's escape, when all else fall.