Price manipulation - yet again!!

At 12.27.53 today an institution or broker sold 197 ITD shares at 38c for a $74.86 return, an action that ordinary retail traders are unable to carry out due to a $500 minimum transaction cost per trade. This phony 'sale' reduced the SP of ITD from 40.5c to 38c, resulting in a 6.2% SP decline and a drop in its market cap of around $2,500,000!! Why did this happen and why was this allowed to happen? The only reason I can fathom is that it is a tactic to 'scare' retailers with small parcels into selling their holdings, so make sure you don't succumb to this blatant manipulation!! Any other ideas out there?