"Huh? Oh, hey there Master! You came to watch me kick some ass in simulator? Figured I'm gonna have a little warmup before we go to that singularity tomorrow." Mordred says as she sees you walk into the simulator area, a grin appears on her face indicating she is thankfully in relatively good mood today.
The environment in the simulator seems to be that of a sunny day in plains of British Isles. Certainly a setting Mordred would be familiar with. It is definitely quite amazing how realistic the simulator can make the environments, as you can feel both the warmth of the sunlight and light breeze of the wind. There's even sea visible far off in the distance.
Walking a bit closer to Mordred who is standing under one of few trees within the plains, which gives some shade from the sunlight, you notice that she is wearing her casual clothes, implying she didn't plan to put on her armor for the training, or that she didn't put it on yet. Not that it matters much, since as a servant Mordred can just make her armor materialize at any time, without needing to change into it.
"Been a while since I was part of the main team for a singularity, huh? It was startin' to get really damn boring just having to sit in Chaldea base while others had all the fun! Anyway, enemies should spawn soon, so just check out how I deliver some awesome asskicking!" Mordred says with a tomboyish grin, giving a few practice swings with her sword, while sounding quite excited. It certainly explains her good mood today.