That's the problem with selective quotation. The following sentence makes clear the issue and the context:
.....The Osprey's big problem is that it risks losing lift in just one of its two engines, in which case it will flip over and begin to fall upside down. This has led to previous test flight crashes which were fatal to all concerned. As the OT-IIG report states, "When descending at a high rate with low forward speed, the rotor can become enveloped in its own downwash, which can result in a substantial loss of lift. … Should one rotor enter VRS and lose more lift than the other rotor, a sudden roll can result, which quickly couples into a[n inverted] nose-down pitch."