There are three window panes on a commercial plane. The outside pane maintains pressure, while the middle one is a failsafe in the event the outside pane fails

There are three window panes on a commercial plane. The outside pane maintains pressure, while the middle one is a failsafe in the event the outside pane fails (the inner pane is cosmetic and to prevent people from messing with the important panes). Without reading the report, the outside pane could have failed and hit the stabilizer while the middle pane continued to hold pressure as expected, therefore no contradiction in the two statements.