I know those disconnector guys. They are just so selfish or noobish that they hate to lose...
Anyway, about tactics.
1. If you bceome player2, you're lucky. When you have your third turn as Link, go to enemy's base and throw all Triforce/triangles out and throw them to neutral safe spot, so he'll lose his points.
2. Don't carry medium or big triangles, throw them! Tap triangle, so Link will run to get it and throw it as long as you can, all the way to screen's edge. Then tap it again and throw.
3. As phantoms, draw lines very fast. Try to catch Link with big triangle or try to chase him into corner. Sometimes it's good to leave one phantom to guard your base from opponent.
4. In some stages, if there is corner or dead-end near your base, this VERY good strategy to protect your triangles: Throw neutral triangle to your base to get points. Then pick it up again and throw it to corner/dead-end. When you change to phantom, put ne phantom in middle of triangles. If enemy comes too close your triangles, he'll get one heck of a whack right to his head!:)