Reported as Vortex Ring.
No, "settling with power", it's different.
North Island Naval Air Forces Command spokesman Lt. Aaron Kakiel confirmed that the crews involved in the incident have been grounded while a "mishap aviation board" conducts an investigation. Kakiel said it is standard procedure to ground crews temporarily until an investigation is completed.
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Of the incident itself, Kakiel said both helicopters "settled with power into Lake Tahoe while attempting to go into a hover."
The term "settled with power" means the aircraft still had power, he said, but not enough to actually hover.
Navy Investigates Videotaped Helicopter 'Dipping' Incident Into Lake Tahoe - ABC News