The third horse was already beyond his ability. The fourth horse, which was more distant and faster than the third horse would obviously give a hard time to the Twelfth Prince.
Thus the little Prince once again closed his eyes and took several deep breaths to calm his nerves down.
Earlier when he thought that he had lost during his third arrow, he was so tense that his heart almost stopped.
Once he got to know that the arrow was not lost but instead was stuck to the target board luckily, he still couldn't relax himself easily.
Until this present second, he couldn't contain his tensed up muscles and thus he needed to take a few more deep breaths than usual to calm himself.
No one forced him to speed up as they gave him his time to relax. In this time, the Seventh Prince successfully made his cheering squad learn how to cheer for the Twelfth Prince and the 'squad' started cheering for him.