Thunderclap raised his right front hoof ready and perfectly willing to step over, and more disturbingly step on Haru to get what he wanted. But just as he was preparing to drop his hoof down on his only friend, something in his mind snapped and as it did, every emotion he'd ever felt played across his face in a flash as his eyes zoned out as he suddenly found himself having a conversation in his mind... with himself!
In his mind Thunderclap could see himself but there were two other creatures with him, and despite not having seen either of them before, Thunderclap knew these two before him were parts of who he was. One was a black Cockatrice and the other smaller creature was pure white Manticore. The pony looked upon the two with confusion as he stepped forward and asked, "Who are you two and what am I doing here?!"
The black Cockatrice spoke first, it's voice dark and filled with malice and contempt. YOU FOAL! WE ARE THE PARTS OF YOU THAT GIVE YOU THE EMOTIONS NEEDED TO SURVIVE! AND NOW YOU HAVE A CHIOCE TO MAKE!
Thunderclap was confused but looked to the white Manticore for answers which he promptly received. However when the Manticore spoke it had a soft, lullaby like voice that despite its softness still echoed as loudly. "Your choice is this Thunderclap... to either forgive your sister for her transactions or to stay on your path of vengeance. The choice is always yours, but know that both choices may very well bring the end of not only you, but your friends, your sister, your parents and possibly all of Equestria. But again... your life, your choice."
Thunderclap thought about what had been said and almost immediately was thrust back into his own body and he suddenly felt his emotional barrier he'd built over the many years alone suddenly shatter and in an instant felt every emotion he'd ever bottled up come flooding through his body. The pegasus slowly lowered his hoof to the ground as he felt his eyes beginning to water as he stared at the ponies around him.
Thunderclap for the first time realized that with absolute clarity, that all these ponies around him cared, even his sister had come all the way out here to apologize and that meant she cared a great deal and that she wanted to help him. As he locked eyes with Haru, he openly began to sob seeing the compassion and friendship in the colts eyes. Without thinking Thunderclap reached forward and embraced Haru in a tight hug.
Twilight for her part was undoubtedly relieved as she could see the change in Thunderclaps eyes as well as his posture. She then found her voice as she asked, "Well everypony, with that intriguing story sorted out, I say we get back to the party!"