Any savvy non-nefarious short has likely already covered after seeing that we didn't break down after the morning dips were getting bought up. If they haven't covered yet, then yes, it would be risky for them to hold over the weekend.

They'd also have to pay interest over the weekend. The 130% interest rate people have mentioned is an annual rate (130% ÷ 365), so it's not as scary or expensive as some seem to think - but the risk/reward isn't really there for them enough to justify paying the expense to hold over the weekend in my opinion.