Biohazard question

The poison that is inflicted. I thought poison was inflicted when an opponent hit my block (ie parry). I was just using quake and I I’m pretty sure I took poison by hitting the block of the opponent. If it’s hitting the block of the opponent then biohazard is much easier than description reads bc I can just use ghost rider. Anyone have any info on this?
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I used Ghost Rider myself for most of those paths, but occasionally forgot about the node and ended up poisoning myself.
Except anyone that plays against those biohazard lanes will tell you that it’s just 100% chance to bleed and poison if you don’t use a immune champ.