We played a game last night and the elf player was attacked by the philosopher. They had a hefty debate about spells that states "cast as you are about to engage in battle" (in this particular case, Summon Phoenix). Player1 said that player2 had to cast Summon Phoenix before he himself (P1) had started boosting his strength. P2 said that it was not required as the text read "Cast as you are about to engage in battle" and thus didn't specifically state that he had to cast it the very first thing.
Player2 cast Summon Phoenix after player1 had used up all strength boosting abilities, but BEFORE P2 himself rolled any dice. I need clarification as neither of the players trusted me nor each other.
Question: Can a player wait until the other player has finished messing around with the states and then cast "Summon X" (obviously before any dice are rolled, I can imagine) or does the "Summon X" spell have to be tossed out ASAP?
Any help settling this feud is appreciated