Boss Tricks: Thardus

Notes:

Laying Morph Ball Bombs in front of Thardus immediately before he uses his Morph Ball mode will knock the cover off his next vulnerable piece, cutting the battle time down by at least half and making the battle a piece of cake without the Thermal Visor.
Using the Plasma Beam will cause much more damage than either the Power Beam or the Wave Beam, further reducing your time in Quarantine Cave.
For the ultimate Thardus spanking, try laying a Power Bomb as he raises his arm to roll into a ball. If timed correctly, the explosion will end that "round" almost before it starts.