I'm sorry, Jon

Expanding that line of thinking, the adrenaline spike from the pain of flesh exploding apart itself like a firecracker going off would push the blood pressure high enough for the parasite to bypass the blood brain barrier and begin a nearly instant infection. The last thing the infected sees is their body explode and their world fade out as their brains are transformed. They might even know what's happening but no longer have the same goals as humans.