chain reaction (series of events) / chain reaction (type of nuclear reaction)

cause, bring about / pull up to a standing position

to change; to become different; to turn into; to become (something else)

entirely; all

everything, all

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

chemical reaction / reaction, response / feedback

to react chemically / to respond, to react / be responsive, be sensitive

he; boyfriend