MotoGP points leader Marc Marquez says he was "angry with myself" for his first crash during second British Grand Prix practice at Silverstone.
The Honda rider suffered a major highside at Becketts in the opening stages of FP2.
Marquez was unhurt in the fall, but had to switch to his number two bike for the rest of the session.
He subsequently fell for a second time, at Village, in the closing moments of the 45-minute session and ended up fifth-fastest, seven tenths slower than the pacesetting satellite LCR Honda of Cal Crutchlow.
Marquez admitted his first crash was his own fault, saying he had underestimated how cool the track was likely to be.
"This afternoon, the first crash was a big crash," said the Spaniard.
"It completely changed the plan for practice, we were a bit limited only working with one bike.
"Of course I get angry with myself, because we're fighting for the championship and we need to control the risk.
"The second crash I can understand because I was pushing, it's normal.
"But the first one, I needed to take care on the cold tyres, because maybe I had extra confidence, I felt good when I went out of the box.
"It was my mistake because I didn't consider we were at Silverstone with the hard rear tyre, it was sunny but not warm like other races.
"We tried to work hard but the problem is the second bike had a completely different set-up. I wasn't able to change it, because it takes a lot of time.
"The confidence was not good, but the laptime was coming well, so I'm happy about this."
Having observed Marquez's crash, Crutchlow said: "If that was anyone else he'd have two broken legs and a dislocated shoulder! I have no idea how he gets away with it.
"And then, to top it off again, the bike nearly hit him and he still managed to miss it whereas somebody else would be cleaned up.
"It shows true credit to how fast he is and also how tough he is to get back up and start going fast immediately, which he was.
"I was coming into Turn 2 [Becketts] and I looked up and thought 'what the fuck's that in the distance?' and it's him flying through the air.
"It was big, honestly. But I'm glad he's OK."