My experience with lithium and fire is relatively small - a laptop battery pack.
However, I can tell you that it can get exciting!
As those individual cells that are on the inside of the battery come shooting out of the case, bounce off the ceiling of my office and then melt into the carpet while setting it on fire and other cells have already turned paper, a trash can, a lamp shade and a desk on fire, I knew that I had to pull the plug out of the outlet in the wall in order to stop the current from igniting even more cells.
Once the power was removed from the equation then a Tundra aerosol spray fire extinguisher ( like THIS ONE) quickly took care of the fires.
Given what I believe would be somewhat larger individual cells in our Ollies I believe that you simply can not afford to be too safe.
Bill