Not sure what version of Photoshop you have, but I decided to try Adobe AI tools to see how that would work
- First selected the two guests without their shadows, and using the quick selection tool an pen tool - then placed them on a separate layer without the background.
Let's call this the subject layer.
- Gong back to the original base layer, I selected the two subjects again and then used Generative Fill to take them out of the background.
-Then I combined the generative fill layer and the background layer so now I'm just left with the icons and logos on this background layer
- Using the remove tool, I began "erasing" them from the background until I was left with only the blue background.
(occasionally I had to apply the remove tool more than once to finish the job)
- Now I've got one layer with only the subjects and one layer with the background
- I duplicated the subject layer and placed it underneath the original subject layer. We'll call this the shadow layer.
- Then, holding own the Ctrl key (CMND on Mac) I clicked on the mask of the shadow layer - that selected the 2 figures.
Then I clicked on the thumbnail.
- Going up to the menu bar, I went to Edit-Fill and filled the underlying figures with black. You won't see this since it's underneath the subject layer.
- Using the move tool, I shifted the black filled area to the right to create a hard shadow. Then went to Filter-Blur-Gaussian blur to blur the shadow and reduced the opacity until I got
a drop shadow.
- Then combined all layers so I have a single image.
- Then using the content aware move tool, I shifted Capt. Kirk and his shadow over to the man on the right.Then put it through camera raw for quick color adjustment
Could use a bit more refinement. I understood there were different ways to address the image - this was my first try. Took some work but
I learned a few things along the way myself. 
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