Let's say you are bombing with your boi who is neither a look out nor tagging, can he get charged with something? Is there such a charge as accessory to vandalism or something similar? This didn't happen to me, it's just a hypothetical. I wouldn't want my non involved homies catching a charge over bullshit. This is all assuming the proof matches (no paint on buddy's hands, not carrying any heat shit)
Depends on the cop and area entirely. Most places will charge you for crime by association but if the cops cool he might be understanding towards your friend.