The Cause-and-Result Structure

Six Semantic Functions of Form VIII (Iftiʿāl): Adoption, Exertion, Selection, Response, Equivalence, and Independent Usage

Split the source example into three pieces.

PartFormRole
CauseغَمَمْتُهُFirst-person subject; -hu object
LinkفَـConsequential sequence
ResultاِغْتَمَّThe affected person becomes distressed

The first event acts upon someone; the second describes that person’s resulting condition. The feature is response to an action, not mutual participation.