Boost converter safety during debugging
The worst case scenario for what you did would be that all 9 watts were available at the 85 volt end of that circuit. This would result in a maximum current supply of 100 milliamps across a dead short. Depending on how contact was made through the body, this does have the ability to be lethal.

In most conditions, the worst thing I would have expected to happen to you is you get finger zapped, but the point here is that you must always exercise caution with live equipment. The Navy trains that anything above 30 volts must be treated as potentially lethal, and deenergized for work whenever possible.