I'm formulating a story idea about a person who can draw energy from outside sources (electrical devices, heat energy, etc) and resuse it. But they can't store the energy in their body, they have to repurpose it immediately.
My question is... what can they do? I'm trying to keep this at least pseudo-scientific. I keep coming back to temperature related things. Like, make something cold by drawing the energy out and make something else hot by putting the energy in. Can anyone think of anything else? (aside from just killing someone by draining them) Even really out-there creative ideas are welcome, I need to make sure I haven't made them too weak or too powerful in some areas.
The help would be much appreciated. Thanks.