On the brink of their first ever Test win in South Africa, Wales suffered a last-gasp defeat when referee Steve Walsh punished Williams' shoulder charge with a penalty try.
The score was duly converted to hand the Springboks a 31-30 victory but Davies, who played in all three Lions Tests in Australia last summer, expects the 23-year-old to recover from the setback.
"He puts a lot of pressure on his performance and he probably feels that he didn't quite hit the level he wanted to. But no blame is being put on him. We rallied around him and he's part of the team. At the end of the day, the squad of 23 wasn't good enough to get the win.
"In the events before that the penalty try we made mistakes that gave them the field position. We're not blaming anyone in particular, we're a team and we didn't perform for the full 80 minutes."