jǐnzhānggǎn mànmàn tuì xiàqù, cái fāxiàn zìjǐ gāngcái qíshí wánchéngle yī jiàn bù róngyì de shì

紧张感慢慢退下去，才发现自己刚才其实完成了一件不容易的事。

As the tension slowly faded, I realized I had actually accomplished a difficult task just now.