When the lady tried to put the bullets on, he took it as a threat. Instead of letting her put it on, he bit at her, aiming for her arm. His rounded teeth probably wouldn't puncture the skin, but they would leave a nasty bruise.
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Grimlock reached the edge of the city. He had the feeling that several others were nearby, however if they were wise they would leave him alone. If this was some gladiatorial match, he had confidence that he would win it easily. He hated being confined, and took his anger out on the buildings, slashing and hacking his way through several before cooling down and stopping. Buildings were not a proper opponent for him.