Here is the key.

Examine the premises,--and bring word whether all is secure." Bates was about to depart, when Keyes volunteering to accompany him, they left the house together.

Having fastened down the lid of the cask, Catesby summoned Fawkes to his assistance, and by his help as many barrels as could be safely stowed in the boat were brought out of the vault.

More than two hours elapsed before Bates returned.

He was alone, and informed them that all was secure, but that Keyes had decided on remaining where he was,--it being so dark and foggy, that it was scarcely possible to cross the river.
"I had some difficulty in landing," he added, "and got considerably out of my course.