You should have snatched him up, wrapped him in a towel
so you could get photos

LOL.
Well....seriously, if the foot is swollen, then you do need to try to examine that more closely.
It may be a sprain (let's hope), but you want to look at the bottom of the foot too just to make sure there's no bumblefoot. He may also have broken or cracked something - hard to know.
Once you get a hold of him, clean the foot, you can try soaking the feet in warm epsom salts, but you need help for sure. Keep him swaddle in a towel since he's a meanie.
I know he's big too, my BO was a big boy, but he was an agreeable fellow so I can't imagine the battle that you may have.
A lot depends on if he will freak out, but as suggested by
@aart limiting his activity may help him heal. You can also give him aspirin for pain, but sometimes pain is a good thing in a way, keeps them from going overboard, but then again, your guy seem to not really care, he's going to try to get you regardless.