Decapitation strikes had always been an indispensable form of warfare in the human military approach. For a beehive-structured community, this was, theoretically, a fantastic approach to use.
In the projection, the mercenary team who entered the Pandora world showed their powerful strength as soon as they went in. The fish-scaled gorillas with bullet-proof skin didn't stand a chance against the armor-piercing bullets of the mercenaries.
Those creatures that had hatched from the eggs and worked under the Queen Bee had various different abilities. If the mercenaries accidentally ran into these creatures, they could have been badly hurt by them. Luck was on their side, as the mercenaries had studied the abilities through the data they had of these creatures.