Perfect response. The threat is out there. It speaks for itself.
And he's really good at this. People keep putting Biden down for his decades of experience, but it's those decades of experience that allow him to recognize traps & avoid them. A lesser candidate might've bitten down hard on that bait.
Like Beto and AR-15s?
Beto fell into a lot of traps by accident, but deliberately walked into that one - it was accepting a general election penalty in exchange (he hoped) for a primary election boost.
Essentially, he realised he needed his campaign needed more visibility and decided to set it on fire to achieve that.
Yeah, I just meant a less-seasoned candidate who's not already well-versed on the subject would've tried to answer it instead of question the motives behind it.