This article below does not mention that these volunteers will first be given some trial vaccines, before being injected with covid-19 virus juice. I'll guess that is just assumed....but should have been mentioned....
Regardless, brave heroic volunteers. If the planet is so desperate, "hey, over here, FDA, world, UK, North Pole.....we have Leronlimab....."

"The U.K. government has signed a contract for the first human challenge studies for the novel coronavirus, in which healthy volunteers are deliberately infected with the virus in a controlled setting, and some receive an experimental vaccine.

Up to 19 volunteers at a time will take part in the tests, to be held at the Royal Free Hospital in London, which houses a Biosafety Level 3 ward. They will be run by hVIVO, a medical research company that specializes in running challenge trials, in partnership with Imperial College London."

This is a sign of the dire situation out there now, and the "desperation" to get something effective out there.
Again, another reason why an EUA (at the minimum) should be granted for Leron now, today, while the trial continues.