(In a game) I am a newbie(Lv29), and I saw B(lv100+) having filled his room's
wall with numerous super-super-rare(SSR) posters, which can be only be earned
with enormous effort. (I don't have any)

I sent the below to him via messaging menu.

> I: スゴイ!

Later, I received the reply:

> B: どうかされましたか? (笑)

^I think it means "Is there anything wrong?"

Do I need to reply about why I thought him amazing?
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2018-12-12T23:09:27.140
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2018-12-13T10:57:00.127
2018-12-13T10:57:00.127
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question
usage nuances
Do I need to reply in this situation?