It’s a state law, so it varies by state. Most states have a list of qualifying felonies. And you have to be an active participant in the underlying felony, rather than simply present. In this case, Smith actively planned and participated in the felony (a burglary).

You have to participate in the same crime knowingly. Its not just that you have to be near them.

For example if I drop you off at a bank and leave, and then you rob it, I very likely would not be charged if I didnt know what would happen.