If you have quoted that word-for-word it seems this person would be in the clear. I mean it doesn’t say “violent felony” just felony. Clearly the shooter was acting to prevent a felony.
I must say I always get nervous about warming up the car unattended. Thieves steal cars when they aren’t running, this just makes it so easy for them.
But I grew up in NYC in the 70s, I always say I’d lock my car if it was parked in the grand canyon.
I live in a supposedly well-to-do suburb in Connecticut and I wouldn’t do it. I suppose it comes down to the zeal of the prosecutor, the skill of the defense and the luck of the draw with the jury. Watch out for the civil suit though.