Aldrich pushed the bandit down the pit which triggered the alarm, this was done intentionally to attract the Ravenfolk here where they can ambush them at ease.
He had hoped that only one would come here so that they can deal with him easily. But he was not unprepared for the two of them to come.
That's when he threw the bomb and it landed beautifully killing one of the demi-humans at once and injuring the other.
The Ravenfolk tried to get up as quickly as possible to escape. He had always believed that Ravenfolk were definitely smarter and superior among the demi-humans.
They might not be as strong as the tigermen or the wolfmen but they had greater intellect and they could fly!
Obviously the situation was disadvantageous to him so he decided to retreat, it's not like he was fleeing for his life or anything! He did not fear humans at all!
He pushed himself off the ground and flapped his wings but he couldn't fly as fast as he wanted to nor was he stable in the air at all.