He saw our crowd go over the fence the night we Frenched it.

But Grierson was too far away to catch any of us, or recognize us.

So he made no alarm, but just waited and prowled until we came back.

He heard the noise we made trying to get up over the wall from the outside, and ran down to that part of the wall.

He didn't make any noise, and stood in the shrubbery until we had all dropped over.