Fang Zhengzhi quickly made the choice between saving himself and saving others.
He really wanted to save others.
But, he needed to save himself first!
Guilt.
Fang Zhengzhi did feel guilty. Even though he did not really mean to slap Princess Shan Yu, it had already happened.
Provide an explanation?
Fang Zhengzhi wanted to explain himself, but this was not something that he could explain himself out of.
He had slapped a princess...
Even if Princess Shan Yu believed that he did not mean to slap her, it would not absolve him of blame! If you were drunk and slept with someone's wife, you would still have to be responsible for it.
Just because it was an accident didn't mean that you were off the hook!
Even without considering the possibility of a baby, the woman's husband would never let you off!
That was the situation Fang Zhengzhi was in.