 After informing the <unk> about the true nature of the Key , Ruwan volunteers to " give " the Key to the Covenant . He is captured and brought aboard a Covenant ship . While the Covenant believe he is to be rescued due to a <unk> embedded in him , Ruwan reveals he is actually a target . A <unk> takes aim at his position and destroys the ship . Upon learning that the Key is a fake , the <unk> on Mars behead Ackerson . In a relief camp , Tyla writes a song about Ruwan . 
