I'm not so sure about a leg bone hit.I think in order for all that metal to snap,the broadhead had to be held solidly,like in the shoulder blade.If it went that deep in the humerus,the humerus would have shattered.
Sorry to say,I did that to a big bear once.The good news is,he survived,was healthy and was taken by another hunter a few years later.
I think your deer will to.The carbon steel broadhead will dissolve.
If it were me,I would not use those heads with out modifying the tip to a tanto design.Those needle tips curl sometimes and this can drastically reduce penetration.I had one of the 125's do that once on an antelope and only got 2" of penetration.It wasn't a good situation but I was able to get close enough to get another arrow in it.That doesn't often happen with antelope in open country.I learned my lesson.
None of us likes to lose game but I think your deer will be OK and you two may meet again.