According to the Giant Beast Compendium, this type of Giant Beast was considered relatively easy to deal with. Its attack method involved preparing and storing poison in that enormous bottle beforehand and then spraying it at its enemy when encountered. Generally, before running into an enemy, such a Giant Beast would not waste time and effort producing poison, given that carrying around a large jar full of it was tiresome. However, at this moment, the hostages were inside the poison jar, and if the Giant Beast were disturbed, just the slightest injection of poison into the jar would kill all the hostages.
Fortunately, there was still a way out.