Basic melee attack is sometimes missing from context menu

[Carl Minden]

Sometimes the basic melee attack was not available as an option in the "e" context menu even though I was adjacent to an enemy. Here are some examples of situations in which I encountered this:

• I had an enemy to the west and south, I killed the enemy to the south, now melee attack is not available to attack the enemy to the west
• After walking up to an enemy and not killing it in one shot
• After missing an enemy that was still in range

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[Jochen Terstiege]

It's only available if the target is not yet an enemy. It allows you to attack friendly monsters. The normal way to attack enemies is to walk into them.