Daniel Ricciardo admitted a panic feeling and finally ended his Azerbaijan Grand Prix after a mistake in fighting Daniil Kvyat.
Ricciardo tried to give Kvyat a step when the pair braked to the left hand Turn 3 on bike 31.
With the front brakes locked, the Australian got into an escape route around the corner, turning immediately to Toro Rosso's Kvyatov.
"Apparently, I don't feel right about what just happened," Ricciardo said.
"We started to pick up the pace, and apparently we closed on Dani. I saw a gap, so I thought I'd go.
"It's always tight (Turn) 3, but I had, initially I said, a commitment I thought I'd pull it out.
"Then I felt like I was going to lock up and skip the corner, so at that moment I'll be honest as soon as I walk down the escape route."
Unconscious that Kvyat, who was behind him, Ricciardo drove to the stationary Toro Rossa.
The resulting damage from the incident is dominated by both outside the race, Kvyat with substantial damage to his car's floor.
"It was just a sense of urgency and a bit of panic if you want, and you're just trying to minimize damage and lose as little time as possible," Ricciardo added.
"I came back and started to walk and I honestly didn't know it was there.
"I think the urgency stopped me from looking, and when I went long to be honest, I thought it would go down and stay on the track.
"Something miserable on my part, I certainly feel bad for the team and for Dani."
The incident and the subsequent retirement marked Ricciardo's third DNF at the beginning of the year at the start of Renault.
It also ended the race, which promised potential points to pay the result, a welcome bonus for the weekend when the team fought.
"We weren't really there all weekend and that's why we would get points that would be pretty good for us," Ricciardo said.
"That's why I'm obviously gutted to keep it out.
“If we finished the race, we would be quite optimistic about it.
“At the moment, I feel quite small. I know I'll figure it out. I'll figure it out. It's just a stupid mistake, but a little panic. "
While Ricciardo retired, team mate Nico Hulkenberg was ranked 14th and finished the race with an empty hand.
He leaves Renault at twelve points and seventh in the constructors' championship, headed by Mercedes with 173 points.