Sentence:  And Mr. Skyros did n't like Angie , but what with Prettyman and three of his boys inside , and not likely to come out - And Angie such a valuable salesman , Prettyman said - All the nuisance and danger of getting in touch with practically a whole new bunch of boys - Why did everything have to happen <WSD>at</WSD> once ? 
Meaning of the word marked with <WSD> tags:  without delay or hesitation; with no time intervening