i believe that johnson told 343 guilty spark some confidential information so that 343 guilty spark would teleport him out of the ring, but thats my logical explanation, in a halo book it says that sargent scaped in a pelican with one or two marines, besides sargent was too important to be killed, they had to bring him back in halo 2
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Good theory, except Spark couldn't teleport people wherever he wanted. He could only use the teleportation grid already integrated into Halo.