Last night: Tower of Zot via leveling roulette. Queued as a GNB with my SGE friend (remember that obnoxious healer friend of mine? They're way better now! Yay!). We got paired with a SMN and... a weird a$$ DRG. From the start the SMN had been skipping and stuttering around, so I take a generic guess that they're probably having some connection problem. The DRG on the other hand... uh..
Packs are dying very slowly. I figured something was wrong with one of the DPS, then I spot the smoking fire: it's the DRG. Single target everything. I did not say anything, not even to my friend in the linkshell and just went on, hoping that they will somehow change their way of playing. SMN miraculously skipping around into safe zones just fine, but I can only imagine how bad the gameplay on their side was.
Moving on to second wall pull before Sanduruva, I figured a wipe would happen right there. Indeed, we wiped. I ran out of cooldowns. This time I mentioned this in the linkshell. Although because at least 1/3 of that pull was gone, 2nd attempt shouldn't gone as bad. I decided not to say anything again into the party. But here's when it start looking weird: the DRG suddenly start AoEing properly. It's as if they have telepathic capability to 'smell' my trash talking in my private linkshell! It feels like a different person just hijacked their character. This went on until final boss where they suddenly back to their former, lousy gameplay. Sometimes they'd just sit next to the sister and... use 1-3 weaponskills before idling with their auto attacks. They take some vuln stacks here and there but needless to say manage to not take any lethal damage (I saw Second Winds and Bloodbath regularly used). SMN's connection also didn't help. They died 6 times to each of sisters' Delta Attack. Yes, the sisters commenced Delta Attack six times. Their carcass was even porting around, it was hilarious to watch.
Not to my surprise, the game decides to display their terrible sense of humor by dropping the Magus Sisters minion.... and giving it to the DRG with a 99 loot roll (I got 92). Many thanks, RNGesus.