1. Broadcast own position - Cost: 7 resources
2. Private message own position - Cost: 5 resources
3. Kill other agent if their position is known to the killer - Cost: 10 resourcese
Maybe I am misunderstanding, but OF course if the only options an agent have is to kill someone it knows (and it costs resources) or make itself known, the better option in the end of the process is to never be known.