I know it is his right to lawyer up, but why would he feel the need to? People died and many are injured. I would lay myself at the mercy of the investigation IF I DID NOTHING WRONG.
And, he did have the presence of mind to find his stuff, gather his belongings and call 911.
Because it doesn't matter if you're pure as the driven snow, you don't talk to anyone who is investigating you for a crime without an attorney present.