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James Anderson warned New Zealand they can expect more of the same after blood was spilled on the pitch on the first day of the second npower Test.
England pace bowler Anderson rearranged Daniel Flynn's teeth with a bouncer and then hit Jacob Oram on the helmet in a fiery over in the afternoon session as New Zealand closed on 202 for four.
Although this Old Trafford surface was not as quick as others in recent years, England hit back well after an initial hunt for wickets with swing failed.
Ryan Sidebottom's double strike before lunch opened up the tourists' batting, however, and Anderson dismissed Jamie How for 64 shortly after the interval.
Building up a head of steam from the Warwick Road end, the 25-year-old pacemen then forced Flynn to retire hurt and seek some emergency dental treatment with the Black Caps 136 for four.
"I went up to him as soon as I hit him and asked him whether he was all right but I didn't get a reply," said Anderson.
"It is just one of those things, I am trying to get him out and I want to make it as uncomfortable for him as possible.
"It is just one of those things that happen, people do get hit.
"There was blood everywhere as soon as it hit him so we knew he needed a bit of help.
"When you hit someone in the head it generally encourages bowlers to do it again because certainly with Oram we thought it was a bit of a weakness.
"He didn't look that comfortable and so you're just going to keep doing it when someone plays it like that.
"We do look at the bouncer as a real attacking option, especially against the Kiwis.
"I thought I had a pretty good rhythm as well, so I thought I would carry on."
Anderson struggled in his initial spell of 4-0-23-0 and it took a switch of ends in the afternoon to gee things up, after left-armer Sidebottom halted the 80-run stand for the first wicket and claimed another in his next over.
"We clawed it back well in the last half hour before lunch and we came out really strong and aggressive after lunch," Anderson said.
"The Stretford end is my preferred end when I play here but the wind was a bit tricky today.
"It is usually at my back from the Stretford end but it was a bit different today and it was a nice to have run from the other end.
"The wind was behind me, I could run in a bit more easily and when you're trying to be a bit more aggressive and bowl bouncers you can use that to your advantage."
How, who nicked one in the fourth over after lunch, and Ross Taylor, unbeaten on 67, were the two batsmen to prosper on a day shortened once again by bad light.
Of Flynn, How said: "He's undergone a bit of dentist work but he's a tough little fella and he'll be all right.
"It is never nice seeing a team-mate like that and any hit in the helmet causes concern."
Having shared in New Zealand's biggest opening alliance since Mark Richardson and Stephen Fleming broke three figures against England on the 2004 tour here, he added: "It was nice because when you win the toss and bat it's important to get a good start."
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