Feeling the bombardment of nether around him from all directions and all at the same time, Blake could only think of a single way for him to be able to somehow avoid whatever was coming towards him.
Blake then started moving his finger as he began drawing one of the most basic runes that he knew with as much speed as possible.
Blake had never been necessarily hastening his rune drawing speed.
He was just original fast at doing it, and the rune drawings that he had done in a second or half a second were almost all possible because Blake just knew all the different parts of the runes so well that he was able to create a path for his finger to finish drawing those runes as fast as possible.
However, now that he was really in a pinch, and his life was possibly on the line in his current circumstances, Blake really squeezed out all of his brain power and also his finger to draw a set of runes as fast as his body was capable of doing.