Was driving along just fine, then suddenly engine revved very high and lost all propulsion. I dropped throttle back and the engine idles fine. Engaging drive in forward or reverse causes engine to rev, but it's like the transmission/propeller aren't engaging. I didnt hit anything, was in 50 feet of water, and prop is fine. Checked the rubber hub after boat was out of water, it looks fine. Checked transmission cable connection point to the lower unit on the underneath/back and it moves up and down when I put it in forward and reverse, so it doesnt appear that the cable broke. Any thoughts?