The gunfire attracted the attention of the ancient creatures flying in the sky, who abandoned the impenetrably hard shell of the transport aircraft and turned their attention to Dong Tianyu and his group – the 'early birds.'
Dong Tianyu picked up his sniper rifle and with a casual shot, blew the head off one of the ancient creatures, killing it instantly.
After firing the bullet, Dong Tianyu was surprised to discover that the bullet was not an ordinary one but a special ammunition containing a splintering warhead. At a certain distance after leaving the barrel, the bullet would split into several smaller projectiles, inflicting damage to an area.
This thing could hardly be said to be a sniper bullet; it was more akin to a fog-gun shell fired from a sniping cannon.
Those ancient creatures wandering around the transport aircraft probably only had their mouths as the hardest parts, with the rest of their bodies not being particularly defensively strong.