Reading what you said, I'm guessing it's something like this: The spikes are really brittle due to the fact they themselves are poison and so as the snake keeps on attacking, you'll probably forget about the spikes. Due to how large the snake is, and how heavy the snake's attacks are, the spikes will continue to crumble and spreading into the air as dust, casing the enemies to weaken. The wide range of the attack (both spikes and physical) ensures that it will be almost impossible to avoid it. But of course, since he has that thing from the albino that made the MC immune to any poison, this is no problem to him.