The eyes were where a dragon was most vulnerable. The eyes, and the brain behind them. Not the underbelly, as certain old tales would have it. The scales there were just as tough as those along a dragon’s back and flanks. George R. R. Martin, A Dance With Dragons
George R. R… Tolkien?
Nothing to see here.
Oh how I hope you will start blogging GoT/ASOIAF, that is, after you blog The Time of the Doctor!
J.R.R.T. presumably got the theme of vulnerable underbellies from pre-existing dragon-tales, especially the slaying of Fafnir by Sigurd/Sigfried.