In the walk-throughs & hints I have seen for this game, they have all suggested that this can't be done unless you are some sort of gaming *expert*. Well, I am no expert and I have done this twice...In order to get rid of the TRITI, I used the Healing Touch as soon as the nurse stopped speaking. I then started removing only the thorns, from left to right - and in rows, top to bottom. Then move on to remove the darkened triangles. You do have to work quickly, but it can be done by even us novice gamers. This works on both TRITI levels. One other thing to remember when removing the thorns(especially the top ones)is to use an 'up-and-over' motion so you don't *miss* and knock the vitals lower.
on the operation called "Death awaits all" after you in ject the sirum into the guilt and the healing touch thing comes in you use your healing touch which stops time completely if you haven't used it alredy if you have start the operaition over and try again. have fun on the rest of the game