The stinging cells or "nematocysts" of a Puget Sound Lion's Mane Jellyfish (Cyanea capillata) are, without question, salmon repellent.
Salmonids will not take any part of a jellyfish into their mouths as they experience similar discomfort in their mucous membranes as we do on our skin when we encounter nematocysts.
Often when trolling you'll notice your wire suddenly develop a large blowback angle and then quickly return to normal. This can happen with other types of midwater drift but more often than not it's a jellyfish and now you've cut it in half.
While your wire was sawing Mr. Jelly in half, it's stinging cells unquestionably made it to your terminal gear. At this point brother,...you have gear in the water... but you ain't fishin'..
Retrieve your gear, get out the paper towels and get to work removing every speck of that red crap off of your gear.
This is the most important point: After handling jellyfish, wash your hands before rubbing your eyes or going to the bathroom and don't ask me how I learned that!