Even though the Red Flame monster did not have any thoughts to run in his mind, when he saw Happy run toward him confidently and fearlessly with his sword sheathed, his expression turned incredibly unpleasant. The Red Flame monster had been about to attack, but he hesitated. Happy could tell based on his facial expression that he forced the Red Flame monster into a corner.
Even though Second Manor Master was chasing after Happy so that they could launch a pincer attack from the front and back along with Manor Master, at the moment Happy sheathed his sword, the three manor masters still felt fear and surprise, because they could sense the threat coming from that attack.