Not sure about that paper - it recommends ocular irrigation (with water) for OC gas… the exact thing you mentioned hurting so bad in your first response. The thing to remember here is that a lot of the discourse on this doesn’t distinguish between the use of a liquid to flood particles away from skin and membranes through it’s kinetic action (possible with CS gas and very necessary with white phosporous) and relying on the chemical properties of the liquid itself to bring any kind of relief.
It’s been done before… before the “Red Scare” there was the “Black Scare” - it’s where the trope of the “bomb-throwing anarchist” comes from.
It’s a valid tactic - but if it’s not carefully done and well thought through, it can end up creating a lot of blowback… as it did for the anarchist Alexander Berkman when he attempted to assassinate the capitalist Henry Clay Frick (hint - don’t assassinate a capitalist during a strike… if the striking workers thought that’d work they’d probably do it themselves).