Seeking to bolster that perception, White’s defense attorneys on Friday called Philip Birchfield to the stand. Birchfield, of Destin, Fla., testified that he encountered Schellenger in 2008 while working as a security guard at a bar in the coastal Florida city. Birchfield said other bouncers tried to eject Schellenger, but he became so unruly it took three of them to carry Schellenger outside. Birchfield said Schellenger threw punches during the encounter and eventually bit Birchfield’s elbow, leaving a scar that remains.