Some abilities do not show in combat log

[Spawnova]

I'm trying to get abilities like concussive shot and silencing shot to show in the combat log but with no success, I'm just curious if such spells are not displayed in the combat log or if I'm missing something.

Here's what I have so far.

elseif event == "COMBAT_LOG_EVENT" then
    local eventType,_,_,sourceName,_,_,_,_,_,_ = ...
    if sourceName then
        if string.find(sourceName, UnitName("player")) then
            local sID,sID2 = select(11,...)
            print(sID .. sID2)
        end
    end
end

I have tried searching before posting, couldn't find anything. =[