Henry after securing his 3d gear he went to get a horse as picking one was just as important, so of course he had to observe every horse and when he found one that looked as though it was sunned by the other horses but didn't care. This was the horse for Henry so once he got it saddled and ready he followed everyone else that were heading towards the gates with his suspense eating away at him. The perfect chance to show his parents he could be just as amazing as them, and that he wouldn't be afraid of these monsters. All he could do was hope his friends didn't get hurt or killed when they did this. They did have trained professionals watching them, but even then they cant just help them all the time if they mess up.