After opening with a huge gap-down and then broke down below key support NQ rallied back up to above support by the close of the day.
Key support is again aat 15,800. A re-break below it could trigger liquidation selling, downside target at gap-close on the daily chart, at 15,550
Intraday resistance is at 15,900 which becomes support if NQ can clearly break above it, with the next higher resistance at 15,990-16,000.