try getting an enemy targeted heal to hit on recluse in the STF when the towers are still up. good luck with that.
Since he could essentially one-shot anything short of a really well-built tank when all the towers were still up (since some of his attacks had dot it would bypass the one-shot code) I'm not sure heals of any kind were really all that useful against him at that point. Although the biggest problem with targeted heals was not that they wouldn't land, but that if they did land you could generate aggro (because the tank also had trouble hitting LR through his defense, and taunt without damage is extremely fragile). That's why the critical tower to take out first was usually the red one (which buffed his damage) rather than the orange one (which buffed his defense). In fact except for a tank grabbing aggro or a really crazy powerful team attempting a blitz run, you probably shouldn't be shooting at LR at all until all the towers are down.
Incidentally, I took a peek at LR's paragonwiki page just to doublecheck my memory on the tower color, and I noticed there was an editor's note about using toggle powers to constantly interrupt Recluse's ability to summon his spider minions. Missing in the editor's note and the tower capabilities is the fact that one of them (I've forgotten which) had a toggle-breaking power. Basically, it periodically rendered Recluse "untargettable" for a split second. Doing so would cause all toggle powers to break off of him. If you tried to lock toggles on LR, you'd have to keep reapplying those often. Players that didn't notice this would lose their toggles and often not realize why.
Figuring out what the towers did was one of the first serious power investigations I did after Iakona retired. In fact, testing the STF was the first and last time I ever did anything in-game with Iakona. We did some testing of Lord Recluse's abilities in the STF on the beta server right after that very first successful beta server Hami test raid.
Going in reverse, I would often tell STF teams I was on that were having trouble completing the STF that the key to the most difficult parts of it were lucks. Just a bunch of purples. Purples would render Ghost Widow - one of the more nasty of the AVs - almost impotent. Lucks would not neuter LR directly, but it wasn't difficult to render even the blue tower worthless and force LR to get more than a little lucky hitting you. There was one STF I was on that the entire team was about to give up and the tank literally dropped and gave up, and I convinced the team to stick it out, Ouroed a tray full of large lucks and distributed them to the team, and we promptly dropped GW with the scrapper tanking her, and then two towers down (red and blue) before they ran out, which was enough for the team to drop LR. They practically thought I performed a magic trick.