I’m not a Romney lover, but I’m unsure what the precedents are for this.
In the final election, you can afford to be polite to a defeated rival because he’s lost and it’s all over. But in a primary election, it’s on to the next state.
So, is this a dirty trick or isn’t it? I don’t really know. In any case, the campaign war isn’t over until your rival has been completely defeated and withdraws.
Highly unlikely that anything of the sort happened. I’ve NEVER heard of candidates being in the same location at victory/concession speech time. And in this case, news reports earlier this evening had McCain already out of the state on his way to SC long before the polls closed.