Consider the example of what occurred with some soldiers of Israel in the days of King Saul:
"And on that day they kept striking down the Phi·lis´tines from Mich´mash to Ai´ja·lon, and the people got to be very tired. And the people began darting greedily at the spoil and taking sheep and cattle and calves and slaughtering them on the earth, and the people fell to eating along with the blood. So they told Saul, saying: "Look! The people are sinning against Jehovah by eating along with the blood." At this he said: "YOU have dealt treacherously. First of all, roll a great stone to me." After that Saul said: "Scatter among the people, and YOU must say to them, ‘Bring near to me, each one of YOU, his bull and, each one, his sheep, and YOU must do the slaughtering in this place and the eating, and YOU must not sin against Jehovah by eating along with the blood.’" - 1 Samuel 14:31-34
Some of the soldiers of Israel became extremely hungry after a long battle and slaughtered sheep and cattle and "fell to eating along with the blood." Their aim was not to deliberately eat blood, but they did end up hastily eating the meat from animals that were not bled properly. Did the fact that this seemed to be an "emergency" excuse their course? No. Their action was labeled as "sinning against Jehovah by eating along with the blood."
For more, see
God's View of Blood