~の至り => extremely ~ N1
The highest (comparative) level
あまりの~に => because the degree is too hight N2
Extreme level
命令形 => Imperative form N4
間 => while; during; between ~ N4
またの… => again, moreover, in addition N3
Necessity, obligation
~なりに/~なりの      => suitable; in one's own way / style N1
の+ [至「いた」]り => Very A N1
Degree/ Level/Amount
この / その / あの => this / that N5
Spatial relations
間に => while; during~ something happened N4
瞬間 => At the very moment N3
Short period of time
始める => to start; to begin to ~ N4
...そのもの => Myself... N2
Demonstrate by example