What is the meaning of すると in this sentence? > > > **** <\-- this one > > I know that Suruto is "hereupon/thereupon/at this point". But "at this point, how is it?" doesn't make a good translation... Can you help ? Thanks in advance :)

The here is a (conjunction), meaning "and", "then", "and just then", etc.
See this J-J dictionary definition #1 or this J-E dictionary.

literally means "How is ~~?", but here it's an exclamation rather than interrogative, and means "to my surprise," "Good God!", "behold!" etc. It's similar to (but probably sounds more literary than) , () etc.

This dictionary carries the sentence as a translation for "And behold!"