Jones suffered his first defeat as Wales captain against South Africa
Captain Ryan Jones insists there needs to be some "finger pointing" to ensure wounded Wales restore their pride in South Africa.
The world champions demolished Grand Slam winners Wales 43-17 in their first summer Test, in Bloemfontein.
Wales play the Springboks again in Pretoria on Saturday, and Jones said: "We didn't do ourselves justice, there will be a bit of finger pointing."
Flanker Dafydd Jones added: "We have loads to prove in the second Test."
The Scarlets flanker suffered a nightmare return to the international scene following a two-year absence, as Wales extended their run of never winning on South African soil.
Warren Gatland's Welsh team never looked like ending their win-less record, as the error-ridden tourists contributed to their own downfall at the Vodacom Stadium on Saturday.
"We did not execute our game-plan, we made too many errors and lacked a pattern of play," admitted Dafydd Jones.
"We didn't get our offensive game going, we chased shadows and, naturally against the best team in the world, we paid the price.
"We must address our mistakes, and in Pretoria take the self-belief we have in this squad and show why we won the Grand Slam - we have a point to prove."
Gatland was missing a host of his Grand Slam heroes such as Martyn Williams, Mike Phillips, Gavin Henson and Lee Byrne.
South Africa were also without some of their World Cup winning stars but showed that their squad has greater strength in depth, giving skipper Ryan Jones and his men a reality check following their Six Nations triumph.
Jones, who could return to South Africa next season to lead the Lions, wants his Wales team-mates to take responsibility and react positively from Saturday's humbling.
"We have to take this on the chin and have six days to turn it around," said the Ospreys number eight.
"We'll go away, take a long, hard look at ourselves individually and collectively.
"Test rugby is about keeping yourself in the game and creating opportunities, and in the first Test we didn't do that.
"We'll have to front up to a man, as the breakdown was key on Saturday and we came off second best.
"It will be a long 80 minutes next week if we don't put it right."