翻译:那一刻我觉得眼前这个平时可以毫无拘束耍宝的人,比最严厉的老师还可怕

That moment I thought at present this usually may not in the leastconstrained play the valuable person, is also more fearful thanseverest teacher

at that moment, i found he was stricter than the most strict teacher who likes to fun others in ordinary times.

at that moment i got more terrible feeling than the most strict teacher from the one at present who is kind to get along with in ordinary time.