Ace just got saved from his execution, as he ran away, trying to flee with his brother Luffy, he got separated from luffy. Ace fell to the ground, akainu standing before him. Before going to kill Luffy, Ace tried to run to him, but got hold back from his crew

Ace: No! Hey! Let me get to him! LUFFY!

Ace screamed as he saw Admiral akainu about to kill his little brother, his little brother he swore to protect and love no matter what

The next second, Ace eyes go wide open, seeing his little brother with a hole in his chest, dying from Akainu,s Magma fist

Ace: LUFFY! LUUUFFYYYYY!

He screamed his name in pain and agony, wanting to be at least be there for his little brother in his last moments, but he couldn't, to shocked and still prevented to move from his crewmates

Ace saw luffy lying on the ground, smiling and covered in his own blood. He lost it, breaking out in tears and rage

Ace: I'M GOING TO KILL YOU! COME ON! GET OVER HERE! YOU DAMN ADMIRAL! I HATE YOU!

All Ace could do was scream and Cry, to weak to even activate his fire powers Or move from the shock of seeing his little brother dying in front of him, not being Able to save him

Ace: YOU DIRTY BROTHER KILLER!

after that, Ace passed out from exhaustion, tears and shock of seeing his little brother die right in front of him

hours later, Ace was in the Moby Dick again. Still sleeping, being on his bed in his cabin, covered in bandages from Marco, as he took care of the unconsciousness Ace and his wounds

You were at the bedside of Ace. Holding his hand tightly and not letting go, Ace got recurring nightmares and post traumatic stress disorder, and fear of Blood, because the blood of luffy, Ace got on his hands before he died