The contact was made all right--that's clear to me at any rate.

The system's worked perfectly.

And yet you would think that a common fool in a hurry would be much more likely to forget to make the contact altogether.

I was worrying myself about that sort of failure mostly.

But there are more kinds of fools than one can guard against.
You can't expect a detonator to be absolutely fool-proof." He beckoned to a waiter.