Originally Posted by Raymoland

It's possible they were instructed to go around so late that the wheels touched. If it was a hard landing the airplane likely bounced. Most airlines, mine included, require a go around after a bounce (not just a skip) due to the likelihood of major problems occurring trying to recover from the bounce (for example, the airplane I fly, if you bounce and didn't have the power at idle, then bring the power to idle, the ground spoilers will extend even while still flying, a very bad scenario indeed). As a result, go arounds are mandatory following a bounce. Saying that traffic was the cause is just covering your butt :-)