Carmax's 15-min chart shows MACD Death Cross and Bollinger Bands narrowing.

Based on the analysis of CarMax's 15-minute chart, there are several notable indicators that suggest a potential decline in the stock price. Specifically, the Moving Average Convergence Divergence (MACD) indicator has triggered a "Death Cross," which is a bearish signal that typically indicates a downward trend in the stock price. Additionally, the Bollinger Bands have narrowed, which suggests that the magnitude of price fluctuations is decreasing, potentially indicating a loss of momentum in the stock price. Therefore, investors should be cautious and closely monitor the stock's performance, as it may continue to fall in the coming days.