The wall is there to ride on. He just hit it with his body instead of his bike.

In BTVS they can. There’s a vampire who’s cursed with having a soul and is therefore unwilling to hurt humans, so he just toddles down to the butcher and gets blood from them.

Soulless vampires either like the hunt or just prefer the taste of human blood. For instance, some vampires just raid blood banks instead of hunting humans.