Conroy in extra inning game

[GCSluggers]

I had Speer on the bench who hadn't pitched in the previous 2 games. Why would they use Conroy for relief when he is designated SP only.

http://fantasygames.sportingnews.com/baseball/stratomatic/atg2/league/boxscore.html?group_id=30899&g_id=67

Any input into this would be greatly appreciated.