Can't find a verb to match this object 「このさわぎを」 > **** > Sekiguchi, who had noticed teacher Togawa and even the students on the other side holding their breath and staringonce again scowled hard at Maruko and teacher Kamiya. I can't fit into my translation. There seems to be no verb that matches with "this uproar".

You can parse it this way:

> **** **** **** ****

= "S1 and even S2 are V-ing O"

is the object for .