[steve86]

But when they’re bidding the market down we benefit.

What is "bidding the market down"? Shorting stocks or futures puts upward pressure on the price of the instrument. Lack of bids at the offer price causes a lower price adjustment.

[steve86]

“Shorting stocks or futures puts upward pressure on the price of the instrument” (when they cover).

[ontap]

Bidding the market down is a euphemism. When there is a glut on the market the lack of activity causes the price to drop.