Yeah, 12:36 eastern time shows over 150k shares starting at 94 and running down to 89. I suspect that may have been short covering: someone who played the TA when the price approached $1 who realized the stock is under accumulation.
I suppose it could have also been profit taking from shares picked up below 70 in March. But I can't imagine doing a market order in that case. A limit below the best ask would have made more sense.
It didn't freak out the other sellers though. At least not for long.