Treachery is a calculated and destructive force, often brewing in absolute silence before erupting into sudden violence. The imagery of a baker and a burning oven perfectly captures how malicious plots are secretly formed and executed. The conspirators prepare their hearts for betrayal just as an oven is readied for a fire [רש״י, מצודת דוד]. The primary approach among commentators is that the criminals set their minds entirely on the impending act [רש״י, מצודת ציון, שטיינזלץ], though some view this preparation specifically as readying for war and battle [מלבי״ם]. While waiting in ambush with evil intentions [מצודת ציון, אבן עזרא], they draw close to one another to share deep secrets [מלבי״ם]. They carefully hide their true motives, sometimes even putting on a display of friendship and joy toward the king and his officials to mask their deadly goals [אברבנאל].
As the night settles in, a period of quiet waiting begins, much like a baker going to sleep. On a practical level, as long as the conspirators lack the opportunity to strike, they simply hold back and wait for the right moment [מצודת דוד]. Planning a rebellion relies purely on thought and requires no physical effort, keeping the plot completely hidden from view [רד״ק]. Yet, this creates a sharp contrast with normal life. While an ordinary baker might actually sleep while the oven is cold or burning low [שטיינזלץ, אברבנאל], the hearts of these criminals never truly rest; they continue to plot and scheme throughout the night [אבן עזרא]. On a deeper psychological level, the baker represents normal human desires. On the night of the rebellion, these everyday desires "sleep" entirely, because the conspirators are completely consumed by their intense focus on murder and betrayal [מלבי״ם].
The turning point arrives with the dawn. The moment morning breaks and the conspirators finally have the power to execute their plan, they are eager to act and strike immediately [מצודת דוד, רד״ק]. The fire that breaks out is no longer a controlled flame meant for baking bread. Instead, it transforms into a blazing, destructive fire meant to consume everything in its path. This raging flame symbolizes the sudden awakening of anger, jealousy, and murderous intent, culminating in the violent execution of the plot, much like the historic assassinations of the kings of Israel [מלבי״ם, רש״י, אברבנאל].