I don't have a scan but I know which issue he/she's talking about. Sinister had captured gambit, bishop and beast (who at the time was dark beast in disguise) they were all chained up, gambit start screaming like he's hurt and sinister unlocks him to see what's wrong. Dark beast sees this and thinks to himself why does sinister care about gambit's health. That's pretty much it. This was before 350 and the mm reveal and I don't dark beast told anyone about his 'suspicions'.