really hard dangling modifier help

[kaleykim]

hello. I'm studying for the new SAT and i came across a question i couldn't understand.
apparently, this answer choice is correct but i do not understand how

"Another visitor noticed my fascination with a tiny writing desk and its drawers, dotted with pin-sized knobs."

isn't this still dangling modifier?? since DOTTED WITH PIN-SIZED KNOBS modify the another vistor??
for instance, if i write...

the speaker explained his reasons, dazzling his audeince.
in this case, the modifier describes the subject = speaker

i was taught that participle phrase (modifier) always modifies the subject when used WITH COMMA

[Alan]

The rule that you cite does not necessarily apply to past participles (such as 'dotted').

The original sentence is perfectly OK, and clearly means "WHICH WERE dotted with...".