[There is an obvious experience that surrounds Zero as he goes about his hunt. The fact that the sun has not rose does not impact his ability at all as this is the norm for him. He listens for sounds, he's quiet and he's extremely patient in waiting for the right moment to attack.
The moment he realizes there is more than one of them nearby, his mobility in his movements find higher and higher buildings to track from as he's more than aware from previous experience of their ability to work as a team. His every step is light, experienced at remaining undetected until he attacks.
Watching carefully from the top of the theater, Zero takes the opportunity given to him and expertly lets a makeshift spear fly, stabbing one of the raptors in the lower neck before the spear embeds in the tree just a few feet behind it.]