The narrative casually introduces the legend of Shiki the Golden Lion , the only man to have ever escaped Impel Down prior to this point. This piece of lore heightens the stakes, framing Luffy’s mission not just as a rescue, but as an impossible feat of historical proportions. Conclusion

As the user of the Doku Doku no Mi (Venom-Venom Fruit), Magellan is literally a "poison man" whose very breath is toxic.

Fleet Admiral Sengoku is informed of Luffy's infiltration, expressing shock that anyone would dare break into the "Great Prison".