What the XAUUSD chart is showingGold's pullback from its August high has come straight back down to retest the level that launched the rally in the first place. I've marked two support shelves on the chart: a broader base near $4,000 that held for roughly six weeks through late June and July, and a tighter launch pad around $4,250 to $4,270 that price broke out from in mid-August before running to a high of $4,696.76 on August 25.The retest of that launch pad is the key development right now. The low print on September 14 came in at $4,253.58, right into that zone, and the session closed back above it at $4,298.80. That is a support-resistance flip being tested in real time: the level that fuelled the breakout is now being asked to hold on the way back down, and so far it has.The descending trendline drawn off the August high adds the other half of the picture. It has capped every attempted bounce during the pullback, and price is now trading right against it.What to watch nextA daily close above the downtrend line, alongside price holding above $4,250, would strengthen the case that this pullback is stabilizing rather than continuing. A break of $4,250 that fails to hold would put the $4,000 base back in play as the next area worth watching.Educational takeawayA level that triggers a breakout often becomes the first place buyers look to defend on the way back down. Watching whether an old breakout zone holds on retest is one of the simplest ways to judge whether a pullback is corrective or something more serious.Risk noteTechnical levels and indicators provide reference points, not guarantees. Market conditions can change quickly, particularly during periods of high volatility. Trade or invest at your own risk and use risk controls appropriate to your circumstances. This article was written by Eamonn Sheridan at investinglive.com.