Had a similar situation on my EC300. Felt like it tightened for just a second, bike stalled coming into a corner. Restarted it about 1 minute later, rode another 15 minutes trying to make it back to the truck, then it seized completely, locking the rear wheel. For those fifteen minutes I felt the same "dragging" sensation you describe and thinking back it was vibrating more than usual (I've always found the 300s vibrate quite a bit to begin with).
When it finally went there was a death rattle and then a dead stop. Crank bearing. Fortunately I had a spare bottom end, have not had time to tear into the other as of yet, other than to take off the top and confirm it was the crank.
Having roadraced two-strokes for many years, I know exactly what you mean about taking a crank out at full revs, max speed. Not fun, or pretty, I used to run the banking at Daytona with two fingers over the clutch for precisely that reason.
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