It's hedging long position in correction periods of overall uptrend, yeah!
I borrow bitUSD from blockchain for some collateral in BTS on lower heights and when price drops i buy back BTS at a lower price and maintain collateral of borrowed bitUSD. I always calculate how much bitUSD I have to have to cover the worst scenario. This is 100% loss measuring from the beginning of last uptrend impulse wave, which is very unlikely.
This way I increase position in BTS in correction phase and profiting back in impulse uptrend phase.
At the end of uptrend when I want to exit this trade, I reduce collateral in BTS to minimum, wait that margin call is executed and then sell reminding BTS.
It's a bit complicated (some tutorial will be great to write), but is the only way on BitShares DEX to profit something in downtrend movements. (effectively a complicated way of shorting)