This speculation is the common currency of BBs. My own view for what it is worth is that if Galantal does not come in as expected then we could see a drop of 50% or so. That does not matter, as we will then have the higher certainty of Eagle which could move the sp by multiples.
I bought quite a few shares on the first drop, and basically am assuming up to a 50% drop from that point if required, whereupon I shall buy more. There is absolutely no reason to sell at this point unless you want to lock in a profit. But if that is what you bought EME for you were in the wrong stock. Too speculative.
Either way it should be a winner, and if not well you can use any losses against CGT!!