Official rule text
78.10 After a combat ends, the player with one or more ships after it is rolled, that player must resolve such an ability immediately after rolling all of their dice. remaining in the system is the winner of the combat; the other player is the loser of the combat. If neither player has a ship f The attacker makes all of their combat rolls during this step remaining, the combat ends in a draw and there is no winner. before the defender. This procedure is important for abilities a If the winner of the combat has fighters or ground forces that allow a player to reroll an opponent’s die. in the space area of the active system and those units exceed
View official source
Source: Twilight Imperium: Fourth Edition - Living Rules Reference: Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 78.10