IMO this popped because the Warrant and option expiry is Thursday. Warrant writers can trade against those they sell warrants to, Most likley the warrant buyers were buying put warrants. MYR has shown it can move 18c a day, so if your in profit, Id keep an eye on this as it could dump just as hard tomorrow the opposite way. Judging by the volume, anyone that needed to cover has done so. Plenty of the volume would have been new shorts as well. MYR can still hit $1- over the next few weeks, or 1.50c I doubt its a given that its going up same again tomorrow, More like another slow burn slide. But anything is possible and surely unpredictable.
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