Motivations for selling at 28ish.
Let's say you're over-invested in Arcam, meaning, you don't have a revenue stream that's large enough to pay the bills. If cornered in such a way, wouldn't anyone sell? Profound ignorance of the situation at hand could be a reason shares have sold at such a low price too.
The bid spread is enormous for AMAVF, $28 for the bid, $38 for the ask price, so I wouldn't put too much importance on the recent low priced sells.