If you watch the tackle again you will see that the defender goes to tackle with his right foot and misses as Lawro sent him the wrong way, and his momentum takes him past Tom, at which point he moves his left leg back towards our man and makes contact. Tom didn't move his foot towards the contact, nor does he leave it dangling there as bait. His movement is natural, but there was definite intent from the defender, so definite penalty, and maybe even a yellow card. That he was already on a yellow is possibly why the second didn't appear.