I'll have to test that last quest being G Rank thing, that coulda been the case with my friend.
I figured it was Abundant since the two times it happened directly to me (happened to him about three) it was abundant.
I don't think the poison I saw was stronger than what ShadowCeadus is talking about, it was the same that High Rank Gigginox does, I was unaware P.Luddy did that poison since I actively avoided him in G Rank.
I also didn't notice the Peco's Sleep Song til my friend ran into ths problem and I thought back, I've also seen the Volvi's sideways tongue lash before but didn't realize it was a G Rank move