He had been told he shouldn't go out alone.
The ground crews had told him to wait for some of the craft that had been re-arming to get heading out so he could work with them.
Ricky Thurston had told them that the Fighting Diamonds were out there, so he wasn't going to sit around, twiddle his thumbs, and wait until some other unit said that he could head out. With that argument being presented, the ground crew (reluctantly) gave him a fully armed V8, he ran through a rushed pre-launch checklist, and then he had been out the bay as fast as he safely could. So when he came out, with the Heitan currently staying out of the firing range of the NMX ships, he had a brief window of safety from enemy fire, and it was during that time when he was suddenly pinged with what looked like the whole Mishu Navy out ahead of him. However, he only had one destination, and by quickly narrowing down locations he was able to locate the Diamonds. So he took off, going through the pocket of destruction made by Yamataian forces. Of course, he couldn't stay in it forever.
Even there, he still had to be careful of enemy fire.
He keyed the Diamonds on the radio as he made his way to their area, trying to avoid any enemy fire, or debris, and moving as fast as possible.
"Diamonds, this is Santô Hei Thurston." He said, head on a swivel as he flew, "I'm making my way to your area now. Requesting permission to fall in to your formation."