England wicket-keeper Matthew Prior says that judging whether or not to refer a decision under the new umpire review trial makes things more difficult than it looks.
England closed day two of the first Test against the West Indies having been bowled out for 318 and have one referral left with the West Indies on 160 for one in reply.
"It is pretty tricky when you are given the responsibility to try and make the decision in a split second, like the umpires usually have to do," Prior said. "It suddenly becomes quite tricky. From a keeping point of view it is actually quite difficult - people say that the keeper has the best view, but at the angles that you are standing at, especially for the decisions, that are going towards leg stump, it is quite hard to see the exact line.
"We have said that if the bowler feels strongly that it is out then you have got to go for it, there are there to be used so you may as well use them.
Ramnaresh Sarwan, unbeaten on 74, successfully had a decision overturned after the umpire gave him out to Steve Harmison.
"We thought that was absolutely plum," Prior said. "Without the TV replays, so it suddenly puts a bit of doubt in your mind and all of a sudden you start thinking 'what is out and what isn't out' and you start second guessing yourself slightly."
Prior had early completed his half-century, making 64 and playing a key role in ensuring that England passed 300.
"I felt very good (with the bat)," he said. "I was moving well and seeing it OK. I was disappointed to get out when I did, I felt I could be more aggressive against the spinner but I just didn't get it high enough and I just missed out but I cant complain at all really.
"You have to pick your moments - there are times when you have to sit in and times when you have to go. I knew that the new ball was going to come on to the bat better, batting with the older ball just didn't go anywhere, so I tried to use the new ball
as much as possible."
© Cricket World 2009