That's the last time I get caught flatfooted.

那是我最后一次感到措手不及。

youdao

But maybe I've just been flatfooted here in thinking that " this is some sort of claim about not being with others, " or things I do by myself.

但也许我考虑这个问题的时候太直接了,认为这说法只是关于“不和他人一起，或者“我自己一人的经历。

耶鲁公开课 - 死亡课程节选

Long ago, when Apple managed its own factories, precisely matching the waxing and waning demand of the market sometimes caught the company flatfooted.

FORBES: Magazine Article

True to form, Golden Wonder's response was flatfooted.

ECONOMIST: Bad for people, bad for profits