Quote Originally Posted by RyougaZell
The only thing I didn't understood is how Mao suddenly dissappeared from the cat...
He didn't. Back in one of the earlier episodes he explained that he lost his body and was now stuck in the body of the cat. He went on to say that as a result of the animals smaller brain capacity the organization had to patch his mind into their sever system in order to keep his human level of intelligence in tact. Since at the end they cut him out while he was hacking through files he simply degraded to the intelligence of a cat over time.