Bronzes are cast, I don't see why somebody who casts bronze might not have cast glass.
The faces in your sculpture are quite classical and both the bronzes and your glass sculpture show the musculature of the human form beautifully.
I am aware of other artists who did play with glass just a little, while their main opus was in sculpture or architecture or metalwork.
Bjorn Weckstrom, silversmith, Prof. GAF Laisner, architect - and of course Sam Herman works in paint and architecture as well as glass. Those are just the ones I know of, off the top of my head.
Wreckstrom's and Laisner's glass output were tiny. (Says she, all chuffed and showing off, because I've got a fabulous bit by each of them.)
Also, many artists are perfectly capable of changing their style completely.
You are bringing some really interesting things here these days, Jay.
