In the Episode of Season 2 called "Owikawa's Shame" ( I Think), BlackWargreymon steps infront of the attack of Owikawa's purple cloud thing. Before BlackWarGreymon is destoryed, he uses his body to seal the one of the Gates to the Digital World. You see Wargreymon yelling to BlackWargreymon "BlackWargreymon BlackWargreymon!" Seconds later, you see Agumon standing with the rest of the Digimon in the Digital World. He says something like "Thank you, BlackWargreymon." I know Wargreymon is fast. But he's not that fast.