The "Thunder Bow" is actually a manifestation of Ye Tianchen's powerful superpower energy, materializing from the abstract. It was named such because at the time of the apocalypse, amidst the raging thunder and lightning, he had a breakthrough into the Emperor-level Superpower realm and comprehended this Superpower Skill. One arrow would tear open the skies and shake the earth with the force of thunder, hence the name.
When Ye Tianchen fired the Thunder Bow, one arrow exploded the second military aircraft on the opposite side, startling the remaining two soldiers operating their aircraft into hastily retreating. They dared not approach or open fire again.
Liu Yu and the others inside the helicopter could not see the outside situation. They only knew that the two fiercely armed military aircraft were destroyed by Ye Tianchen in less than two minutes after he took action.