While Zok was busy chatting with the system, he did not register Kaira's low growl. She had sensed someone or something was coming towards them and that certain someone did not have any good intentions whatsoever.
Cero immediately jumped in front of her while Shira hid behind Kaira. Just as Cero did that, a sharp arrow shot out of the bushes around them. Cero's hide was thick enough for the arrow to bounce off harmlessly.
But if he hadn't jumped in front of Kaira, she would have been the one to take the hit. The arrow might have ended up grievously harming her as her fur would not have been able to resist an arrow coming at her with such high velocity.
By this time, Zok finally became aware of the situation and brought out his spear before running up to his pets. Thankfully, none of them was hurt. Zok glared at the bushes around them and only then did he realise that something was off.