I really don't want to get dragged into the law again, but here goes.
You have no right to defend your property with deadly force. Even when someone enters your home, if they're only going to steal stuff, you can't shoot them. However, if you think they're going to attack you, you don't have to retreat and can fire back. I think this is a matter of interpretation here rather than a clear answer, but think about it before you decide whether HYDRA Bob is allowed to fire (I will be seriously disappointed if he isn't HYDRA Bob, btw). If HYDRA Bob knew they were only going to steal stuff and chose to fire and had shot and killed someone, Bob would be the murderer, not the other way around.
Simply entering a place is a trespass. That's a misdemeanor or something you can sue over. It isn't a felony. Likewise, Breaking and Entering with the intent to trespass or to steal something isn't necessarily a felony. Burglary is Breaking and Entering with the intent to commit a felony. There was a breaking (they opened a door) and an entry (they crossed the threshold into the building). Some laws still require the place to be a dwelling but I'll ignore that.
So what was the felony. It comes down to what they were trying to steal (I'll assume they had the intent to steal at that point even if they hoped it could be avoided through negotiation even then). If what they were stealing was over a certain value, it would be felony grand larceny. If not, it would be misdemeanor petit larceny. What's the value? You'd have to tell me where the World War II bunker was for me to know. I would assume it had a decent value, but there's no way to know for sure. I'd also assume that the people who owned the facility had a right to own it and it wasn't owned by the poor Kree bastard in the tube. So it's possible it was Grand Larceny, in which case it was a burglary.
Maybe, alternatively, they intended to commit a robbery (they did in fact commit a robbery). But did they intend to commit the robbery before they were shot at or did they still intend to negotiate a peaceful solution? If we're talking about the law, that's relevant. But, once again, why are we talking about the law?
You have no right to defend your property with deadly force. Even when someone enters your home, if they're only going to steal stuff, you can't shoot them. However, if you think they're going to attack you, you don't have to retreat and can fire back. I think this is a matter of interpretation here rather than a clear answer, but think about it before you decide whether HYDRA Bob is allowed to fire (I will be seriously disappointed if he isn't HYDRA Bob, btw). If HYDRA Bob knew they were only going to steal stuff and chose to fire and had shot and killed someone, Bob would be the murderer, not the other way around.
Simply entering a place is a trespass. That's a misdemeanor or something you can sue over. It isn't a felony. Likewise, Breaking and Entering with the intent to trespass or to steal something isn't necessarily a felony. Burglary is Breaking and Entering with the intent to commit a felony. There was a breaking (they opened a door) and an entry (they crossed the threshold into the building). Some laws still require the place to be a dwelling but I'll ignore that.
So what was the felony. It comes down to what they were trying to steal (I'll assume they had the intent to steal at that point even if they hoped it could be avoided through negotiation even then). If what they were stealing was over a certain value, it would be felony grand larceny. If not, it would be misdemeanor petit larceny. What's the value? You'd have to tell me where the World War II bunker was for me to know. I would assume it had a decent value, but there's no way to know for sure. I'd also assume that the people who owned the facility had a right to own it and it wasn't owned by the poor Kree bastard in the tube. So it's possible it was Grand Larceny, in which case it was a burglary.
Maybe, alternatively, they intended to commit a robbery (they did in fact commit a robbery). But did they intend to commit the robbery before they were shot at or did they still intend to negotiate a peaceful solution? If we're talking about the law, that's relevant. But, once again, why are we talking about the law?