Is this gramatically correct?

I'm writing a story for English class, and I am a bit confused with when to use semicolons. This is the sentence I have written down: "I felt the anger boiling up inside of me as I slammed my locker and turned around, only to see him manuevering his way through the herd of kids, hand in hand with her;... show more I'm writing a story for English class, and I am a bit confused with when to use semicolons. This is the sentence I have written down: "I felt the anger boiling up inside of me as I slammed my locker and turned around, only to see him manuevering his way through the herd of kids, hand in hand with her; seemingly happy."
In this case, I want it to play out as if the narrator turns around and see's the boy smiling as he is holding the girls hand. Is that the proper way to write that sentence, or should I instead remove the 'seemingly happy' and start a new sentence that would say "He seemed happy."?
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