Zero felt that presence disappear but couldn't understand the feeling that he got. However, he assumed it might have something to do with Guardian Deity.
( Is this because of Ancient Dragon's Heart that I ate? )
Zero thought to himself. He didn't fully understand the situation well but thought that Guardian Deity was looking or at least assuming he was looking at him, it was because of the Ancient Dragon Heart that he ate.
Zero already knew that the roar was that of Dragon, though he couldn't differentiate between different Dragon species. But since the presence was of a powerful creature, it must be at least Rank-SS Dragon.
So, the chance of the Guardian Deity being an Ancient Deity was high. Zero thought that perhaps he might want to exact revenge as Zero had eaten its species heart.
He has his guard up but fortunately nothing happens and they resume their journey as normal. The journey was smooth and almost had zero encounters with monsters.
