So, my confusion was not understanding that question #5, as explained in the video, is really comparing potions to all things that are poisonous and all things that have beneficial effects, not comparing all potions to poisonous potions and things that have beneficial effects. So, potions in witch's hut -m- poisonous things and potions -m- beneficial things allows you to infer poisonous things -s- beneficial things.

@RyanPrioreschi From the section Quantifier "Many" - On the LSAT, you can translate "many" to "some." Technically, this is false. Technically, "many" only implies "some." But I've never seen the test exploit this technicality to our disadvantage. Instead, it helps us avoid an actual trap of confusing "many" for "most."

I don't understand how we could be comparing "accustomed to" and "now" when the verb maintained is in a simple past form. Without more context, we can be comparing recent events but nothing indicates current events.

@JodiChan This provides context that the function of stripes is unknown outside of the argument being made. You can remove that information and the argument still maintains support for the conclusion that the stripes protect from horse flies. Consider what the ultimate goal of the passage is and the fact that the lack of camouflage has no effect on whether or not the conclusion is supported.