I walk into the kitchen - kettle is full and nearly boiled. Mug is next to kettle with teabag in.
Me: "I'm going to have some of your water if that's OK - shall I fill up your mug?"
Other person: "It's OK I'll do it"
I take some of the water (leaving more than half a full kettle)
Other person: "It wasn't done yet"
Me: "Yes it was it had just clicked off"
(kettle is still in my hand)
"Do you want me to put it on your tea?"
Other person: "No I'll sort myself out"
Other person fills up kettle and puts it on to boil again.
Me: "Sorry did you need the whole kettle? I thought you were just making tea"
(note that this person always fills the kettle up all the way immediately after using it - not just before using it - so I should not have assumed that full kettle = more than just a cup of tea planned as you might with someone who only filled up kettles as much as they needed)
Other person: "It's alright"
I hang around in the kitchen a bit more doing a couple of other things.
Other person waits for kettle to boil again, makes cup of tea.
Cup of tea that could easily have been made with the over-half-a-kettle of just-boiled water that was already there before they filled it up again.
I busy myself in the kitchen for a few more minutes to just check that I saw what I thought I saw, and that nothing else was needed from the kettle.
What happened here exactly?