Not everyone who works in Exception Handling, or even every Keeper, is read in on every one of Civilization's secrets.  Not everyone in the loop on this secret is watching Merrin on the video feed all of the time.  Also there are some non-masochists in the world who apply pain to themselves to refocus their concentration.  This particular hand grenade isn't going to explode until two years later.

Not everyone who works in Exception Handling, or even every Keeper, is read in on every one of Civilization's secrets.  Not everyone in the loop on this medical emergency is watching Merrin on the video feed all of the time.  Also there are some non-masochists in the world who apply pain to themselves to refocus their concentration.

This particular hand grenade isn't going to explode until two years later.

Not everyone who works in Exception Handling, or even every Keeper, is read in on every one of Civilization's secrets.  Not everyone in the loop on this medical emergency is watching Merrin on the video feed all of the time.  Also there are some non-masochists in the world who apply pain to themselves to refocus their concentration, though it's not common.

This particular hand grenade isn't going to explode until two years later.

Not everyone who works in Exception Handling, or even every Keeper, is read in on every one of Civilization's secrets.  Not everyone in the loop on this medical emergency is watching Merrin on the video feed all of the time.  Also there are some non-masochists in the world who apply pain to themselves to refocus their concentration, though it's not common.

This particular hand grenade isn't going to explode until a few years later.