The situation is so bad already on BBI - the share price is trading at a price implying heavy dilution + may be a bit of option premium (on the odd chance that the cornerstone investor buys in at 7/8c or a buyer for some assets emerge).
Any short trade surely doesn't offer the greatest risk / reward!
Whenever bbi and beppa prices start to converge there is good opportunities to buy the spread. The best recent example was beppa @10c vs bbi @8.6c
When beppa is trading at under 1.5x bbi, i think it is not a bad spread. That is where the risk / reward is imo.
But again I ask, does anyone know where you can short sell bbi? Not saying I will as I'd prefer to go with the momentum.