Missed first base and then tagged

[chicago11]

I think some of the confusion here is that everyone is interpreting the situation differently. I am not 100% certain of how this play went down. Initially I pictured the fielder bobbling it, swiping and missing a tag and then applying a tag just as the B/R passed first base. Others saw F3 missing a tag, realizing the B/R and then chasing the B/R. Yeah, if the F3 chased the B/R, it would seem to be an appeal.