I couldn't find any testimony from nurses/doctors remembering specifically the events before B collapsed. But here isn use Ellis's recollection of the moments immediately before C collapsed:
11:48am
A discussion on trophic feeds was had "before 11pm", with the feed administered at 11pm.
Ms Ellis said "there was nothing particularly striking" about the care for Child C between 8-11pm, he was "doing well" and was "feisty" at that time.
11:53am
A retrospective note written by Ms Ellis says: "Had 2x fleeting [Bradycardia]s - self correcting not needing any intervention shortly before prolonged [Bradycardia] and apneoa requiring resus[citation].
She said she had left the room "just around the corner", then the alarm went off. She said she could not recall which type of alarm it was - a lower-level yellow or a more frequent [urgent] red alarm.
She said she went into the nursery, having been out for "not a long" time.
She recalls, upon entering: "I saw Lucy standing at [Child C's] incubator. She said he had just had a Brady and a desaturation. I can't remember what she was doing at the time."
11:57am
"After that, the 'brady' and the desat resolved quite quickly."
Ms Ellis said she didn't do or see anything being done to correct the desat and bradycardia, as Child C self corrected.
She added she then sat at a computer which faced a wall, with Child C behind, out of view.
She explains Lucy Letby was still in there, but not sure about anybody else.
Child C, Ms Ellis tells the court, had a further 'brady' and desaturation which did not resolve and required resuscitation.
She said when she turned around, Lucy Letby was stood at the incubator.
A nursing colleague had asked her to put out a crash call.
11:58am
Prior to administering the 11pm feed, Miss Ellis said she had aspirated a tiny amount of 'light green bile' from Child C.
12:00pm
A nursing colleague who was in the room said to put out a crash call, and Miss Ellis left the room, she tells the court.
She said she left the room "not long".
She said when she returned, a nursing colleague was getting ready to administer drugs, and for her to continue chest compressions.
She said Lucy Letby was at the side of the incubator, but cannot recall what she was doing.
Miss Ellis said the medical team of registrars arrived along with a doctor to the unit at some point.
12:03pm
Miss Ellis adds the parents were then informed.
She said she became upset herself as this was "the first time" something like this had happened in her experience, and she found it "overwhelming".
Lucy Letby said to her: "Do you want me to take over?" to which she said: "Yes."
Miss Ellis said she then left the room, taking a minute to compose herself, before returnnig to the unit to look after other babies.
12:05pm
The nursing note says care for Child C was handed over to senior nurse Melanie Taylor following the collapse.
Miss Ellis reiterates that, from memory, there was nothing that concerned her about Child C's condition between 8pm-11pm.
.....
2:09pm
Miss Ellis said there was "always a nurse" in the room looking after Child C, even when she left the room briefly. She said Lucy Letby was in there, and cannot recall if Melanie Taylor was also in there.
12:12pm
Miss Ellis says Child C "could have had" two bradys, as they are quite common.
She said she did not know whether Melanie Taylor was in the room at the time of the collapse.
12:13pm
Miss Ellis tells the court for one of the two bradys, Lucy Letby was in the room for the second one, but not the first.
She says she does not remember if Melanie Taylor was in the room at the start of the collapse.
Mr Myers puts it to Miss Ellis that Lucy Letby was not in there at the time of the collapse, and only arrived later [during the resuscitation efforts].
Miss Ellis: "I don't agree with that."
Mr Myers: "You have placed her there when you spoke to the police several years later."
Miss Ellis: "I don't agree with that."
12:21pm
Miss Ellis has finished giving evidence for Child C.
Recap: Lucy Letby trial, Friday, October 28