Did he? The view they showed on MOTD2 was with a zoom lens which foreshortened the distance. In practice, the lino would have been standing in the other half of the field, more than 30 yards away. What's more, at the point of contact Haidara was between McManaman and the linesman and it would have been difficult to see with the right degree of confidence where the contact was made.
We're all angry about a tackle which has put a young lad's career in jeopardy, but we have to be realistic about what we can expect from officials. They can't give what they don't see. People saying that Halsey could have sussed out what happened by what was going on before and after his view was blocked are in cloud-cuckoo land. No-body can say how long his view was blocked for, and in any case he can't send a player off based on supposition. That's basic.
Wow