I am trying to better understand this sentence:
It's amazing how interested you are in these subtle nuances.
Is the following an accurate understanding of this contraction? Written in what I perceive as basic, plain Japanese (without honorifics), perhaps the sentence would read as thus:
Then the " いる。それは、" can be contracted to
Then the する is put into 敬語 and further contracted.
I know the order of this process is arbitrary, but is my understanding correct? If anyone could explain what the していて、/-てて is doing specifically, I would appreciate that as well.