Sheyan looked at Sanzi and smiled as he said, "You want to know my abilities? Sure, just fight me and force me into a corner. You'll naturally get a thorough feel of the full extent of my ability then. But let me warn you - a few mutated rats are nowhere near enough."
Sanzi had recovered from his initial awkwardness. He was timid and introverted only when dealing with unfamiliar people, but with Sheyan he was very relaxed. He's just slow to warm up to people.