Try this next time you want a person lit by a softbox and you have no softbox:
Use a computer monitor.
Display a white background (e.g. open a word document) and hey presto: a big and efficient softbox. And if you use a fast lens (e.g. a 50mm f/1.8), it’s plenty bright as well.
And you can even use it as part of the picture:
Tell me that’s not cool: photographers improvise.