"It is obvious as a keeper you have to be aware of situations like that," said the veteran Dutchman.
"The rules are the same everywhere. If a player asks the referee if he can take a quick free-kick, he can take it.
"We have seen this kind of thing happen all over
"As a keeper, that kind of thing will probably happen to you once in your career. It was a good time for it to happen in our favour."
He also believes United's players shouldn't have got involved with the
"I have never seen that before," he admitted.
"I actually think we should just have played on. It was a legitimate goal and that is it."