Bitcoin has had a strong run since bottoming near $75,000 on September 16. The price pushed above the swing area between $81,517 and $82,833, then cleared the 38.2% retracement of the decline from the October 2025 high near $126,272. That retracement comes in at $83,916. Momentum carried Bitcoin toward $87,300 yesterday and again today.Now the buyers are facing a test. The US 10-year yield is up 16.8 basis points to 5.135%, while the Nasdaq is down 1.28%. That shift in market sentiment has coincided with a pullback in Bitcoin. Some of this week’s gains are being given back, but the price has not yet fallen far enough to hand control back to the sellers.What would change the bias?The first level to watch is $83,916. Moving back below a retracement level that Bitcoin broke on the way up would be a warning that the latest burst of buying has faded. The more important test, however, is the swing area from $81,517 to $82,833.Why does that area matter? It acted as resistance before the breakout. After a breakout, traders often look to see whether former resistance can hold as support. If Bitcoin pulls back toward that area and buyers step in, they would show that they are still willing to defend the move higher.As long as the price remains above $81,517–$82,833, the buyers are still in play, even if the rally pauses or corrects further. A move back below the area would tell a different story. Traders who bought the breakout could start to question it, and disappointed buyers may add to the selling.For now, the rally is being challenged, but the key support has not given way. In the video above, I take a closer look at the technical levels driving Bitcoin and what would give buyers or sellers more control from here. This article was written by Greg Michalowski at investinglive.com.