because wall street got used to seeing negative news from WAG last 2 years. This OK news with bad same store sales number was better than most analysts were looking. That is all.
When things settle, WAG will be headed to mid 30s. Check the chart, stock went up from low 30s to low 40s w/o any good news. Most likely some of these abc/Booth activities leaked prior to the news.
ABC who got huge business away from CAH is barely up since the news. LOL