Quirrell doesn’t have a very large window in which to drink the blood.
According to this he should have plenty of time:
“Is it possible to Transfigure a living subject into a target that is static, such as a coin—no, excuse me, I’m terribly sorry, let’s just say a steel ball.”
Professor McGonagall shook her head. “Mr. Potter, even inanimate objects undergo small internal changes over time. There would be no visible changes to your body afterwards, and for the first minute, you would notice nothing wrong. But in an hour you would be sick, and in a day you would be dead.”
This presumably means don’t transfigure anything into food. However it could also be interpreted to mean, don’t transfigure food into anything. I am somewhat disappointed in McGonagall for not catching that ambiguity.
Also Quirrell is not a recognized transfiguration authority:
“If I am not sure whether a Transfiguration is safe, I will not try it until I have asked Professor McGonagall or Professor Flitwick or Professor Snape or the Headmaster, who are the only recognised authorities on Transfiguration at Hogwarts. Asking another student is not acceptable, even if they say that they remember asking the same question.”
“Even if the current Defence Professor at Hogwarts tells me that a Transfiguration is safe, and even if I see the Defence Professor do it and nothing bad seems to happen, I will not try it myself.”
However since Quirrells past is unknown (as far as Hogwarts is concerned) he could be one of the best transfigures in the world and he wouldn’t be recognized as an authority. Also I don’t see Quirrell neglecting something as useful and versatile as transfiguration, so I would expect him to know how dangerous eating formerly transfigured food is.
That, and “the current Defence Professor” refers to a different person each year. She’s giving the students a whitelist of people who are an authority, and drawing a bright line of no one being an authority unless explicitly being on the list.
According to this he should have plenty of time:
hpmor ch15
From the transfiguration rules:
hpmor ch15
This presumably means don’t transfigure anything into food. However it could also be interpreted to mean, don’t transfigure food into anything. I am somewhat disappointed in McGonagall for not catching that ambiguity.
Also Quirrell is not a recognized transfiguration authority:
hpmor ch15
However since Quirrells past is unknown (as far as Hogwarts is concerned) he could be one of the best transfigures in the world and he wouldn’t be recognized as an authority. Also I don’t see Quirrell neglecting something as useful and versatile as transfiguration, so I would expect him to know how dangerous eating formerly transfigured food is.
I think McGonagall doubts Quirrell’s goodness more than his knowledge.
That, and “the current Defence Professor” refers to a different person each year. She’s giving the students a whitelist of people who are an authority, and drawing a bright line of no one being an authority unless explicitly being on the list.