What did Paul remember when he had a flashback after hearing the name Castor? Explain in detail using textual evidence.

Erik confronts Paul, and his actions finally jog Paul's memories of that fateful day when he was forcibly blinded by his sociopathic brother and his friend. The name Castor brings back a sudden flood of memory. Here it is, the memory he’s been trying to recall all his life. It happened back in Houston, in a different housing development where Erik used to have a sidekick named Castor. Castor did Erik’s bidding—just as Arthur does now.