The question sets up a gestalt that ultimately engineers an answer. And the answer seems believable. Sometimes we're not even aware of the questions we're asking. A simple statement or thought often has a silent or implicit question behind it. The unspoken question causes him to wait for confirmation, and by the time clear confirmation comes the trade has passed him by.
Opportunity passes like a cloud.
The person doesn't say now I'm going to think about all the terrible things that could happen to my trading and make myself feel bad and maybe bring it to pass. Strangely, thought mixed with emotion tends to attract that which we think about. Positive worry is just the opposite. Only this time you ask for what you want. The process is the same.