Omar uses an elaborate system of notes to remind himself of what he has left to do.
is it reflexive
or intensive

It is intensive due to him concentrating on one subject; "what hehas left to do."

Generally spontaneous human combustion is something that still bewilders some, human combustion happens very rarely and doesn't affect the surrounding areas, so unless you want to set your self on fire, human combustion will remain spontaneous and very rare.