The biggest argument in favor of Constellation Energy stock just became a liability.Electric utility stock Constellation Energy (CEG -10.85%) tumbled 10% through 10:35 a.m. ET Monday morning despite beating analyst forecasts for third-quarter earnings this morning.Wall Street anticipated Constellation would earn $2.64 per share, adjusted for one-time items, on sales of $5.7 billion. In fact, Constellation says it earned $2.74 per share, and sales exceeded $6.5 billion.Constellation Energy Q3 sales and earni ...