While they're talking, Jazz' real body moves closer until it is close enough to touch but still away enough to not present a danger to Midvalley.
"Look at me," the holo says, meaning the true form.
The bot's chest opens, revealing pale blue fluid which swirls around in what for a human would be a heart. For his people it is only a storage unit, this little thing that contains everything a child of Cybertron can ever be. This is his spark chanber.
"Look at me," he repeats.
The nanite filled liquid they call energon for simplicity's sake seems to move on it's own accord. As if it were a living thing... and that is what it is.
This mass of deadly 'slime' is what Jazz is. Everything that makes Jazz the individual he is now is stored in these swimming memory cells.