Both were stubborn even in the face of facts.
We begin with the conclusion, based upon theological principles, that the New Mass displeases and offends God. But here were have a purported miracle which suggest the contrary.
While I can imagine a Host turning into blood might suggest the contrary to some who are already willfully blind to the abomination of the NOM, that thought never entered my mind nor does it seem to have entered the thoughts of others here.
To me, valid miracle or not, it likely means that particular NO service (and therefore many other NO services) are valid sacrileges which greatly offend God - perhaps so much so that He chose to show His pain and sorrow on this occasion. Why He chose to do this we will never know unless He reveals His reason.
Like you, I fear +Williamson will not leave it at that but will draw some theological conclusions from this which in some way, shape or form favors the NO, which I agree, is incredibly dangerous.