Suppose that a paper is submitted to a journal and that the editor decides to sent it out to two reviewers. Each reviewer agrees to return the report in X months; however, it turns out that one of them is much faster than the other. The editor thus receives the first report, which firmly recommends rejection. The editor does not wait for the second report and rejects the paper.
How common is this scenario? For what is worth, my field of interest is mathematics.