Made me wonder, was this some blind impulse to defend myself, or to knife my own skin bloody in a lunatic self-aimed panic attack?

The being acted by a blind impulse from without, or from within, is little odds.

He's too smart to destroy the activator on blind impulse alone.

These poor creatures are victims of nature's blind impulse toward self-perpetuation.

We know that it has a complex brain, or something analogous, and its actions certainly show something more than blind impulse.

What they seem to need is a strong, benevolent authority figure--someone to give order and direction to their blind impulses.

As this feeling is not merely a blind impulse, but a complicated psychic phenomenon, it can be subjected to a psychologic analysis.

David found himself struggling against a blind impulse to take Keral in his arms again.

Almost, at times, he forgot where he was going--forget everything but the blind, primitive impulse of flight.