My take - Land. From 500ft on approach, you're probably going to be on the floor before you can do any decent analysis of what you hit. Talking about it to ATC (If appropriate) can wait. If it has, or if there is a risk of it having taken anything out, a go around is only putting you up there longer.
And in the example C150/2, you can open the side window, and poke your head enough to taxi off - without being a hero
Out here we get wedgetails out in the country. B-I-G bu**ers - up to 2.5m wingspan, 5kg. Love them when gliding, the best thermal indicators on the planet. They'll quite happily let you come up within about 10m before they pin the wings in and drop - or just ignore you as you cruise by. Was somewhat suprised to meet one over the city in a 172 yesterday - even more so as he was head to head, full flare, talons outstretched; don't know if he was in attack mode, or just desparately working for clearance!