A profound gap between expectation and reality fueled the harsh reaction of the Aramean army commander. He anticipated a dramatic encounter, both in the personal honor he would receive and in the exact way the miraculous healing would unfold. When the prophet chose to remain inside and merely send a messenger, the commander's anger flared on two distinct levels.
On a personal level, he fully expected the prophet to come outside and grant him the respect befitting a man of his high rank. He assumed the prophet would stand before him, just as one stands before kings and government ministers, rather than remaining seated in his home [מצודת דוד, אברבנאל].
On a practical level, the commander believed the prophet's physical presence was absolutely necessary. He thought the prophet needed to see the patient up close in order to properly direct his prayers [רש״י, מלבי״ם]. Instead of receiving a simple instruction to wash, he had envisioned a spectacular ceremony. He expected the prophet to pray, call out in the name of God, and perform a genuine wonder using impressive hand gestures [מלבי״ם, שטיינזלץ]. He imagined the prophet raising and waving his hand toward a specific location to draw down a miraculous healing power, thereby fully removing the disease [מצודת דוד, רד״ק, שטיינזלץ].
The primary approach among commentators is that the commander expected the prophet to wave his hand directly over the diseased flesh itself. However, other perspectives suggest he expected the prophet to gesture toward the place where he normally worships God [רלב״ג]. A completely different approach proposes that the intended location was the Jordan River. According to this view, the commander anticipated that the prophet would wave his hand over the river's waters to infuse them with supernatural qualities. Because the prophet did not perform this act, the instruction to bathe seemed like a purely natural and pointless task. After all, if the cure relied on simple washing, the rivers of Damascus would serve just as well to cleanse the body [אברבנאל].