Bailout Jack

Last week we had an issue with Les's rebreather, it failed at 60 meters on 2 separate dives. Jack took the head away and did his magic and replaced the cells. Yesterday Jack and I went back to NDAC to test the unit, the plan was to drop down to the bus and check the PPO2 on the way there to see how often it was fluctuating and then to go to the boat at 45 meters, then, if all OK descend to 60 meters. This involved poor Jack just staring at the screen for most of the time. The setpoint was 1.2 but if it started to creep upwards Jack would inject a wee bit of Dil, this only happened once on the descent, it touched 1.3 a quick squirt and it dropped to 1.2 His thoughts were that it was sorted, mine were, its going to fail. Hmmm, lets watch the video:

[DEVINE.IMAGE.]

What was the reason for the dil flush if there was a blank screen great video