Only reason I can think of is if a trader had shorted the stock and now had to buy back as BRS will be delisted shortly after 13thMay.
Week 46 Wrap: Copper hits 2mth low as Trump threatens net zero pace; US rally fades; HotCopper’s picks
AN1 CuFe sells its Crossroads gold royalty to Northern Star for $4M cash; says better than waiting for mine launch