Orthar and Silva charged at each other aggressively. Yet, they both knew the fighting style of the other perfectly. Silva wanted to use his venom-beam to quickly end the fight, but Orthar never gave him any chance.
Silva knew that Orthar could morph his body into different shapes. Shooting a venom-beam wasted a lot of his power, which meant that he needed a good opportunity to hit Orthar. Yet, Orthar never gave him that opportunity.
On the other side, Orthar tried his best to dig into Silva's body, but Silva never gave him an opening. Silva knew that he would die if Orthar managed to dig into his body, while Orthar knew that he would die if he were hit by Silva's venom-beam.
Like this, the fight continued for several minutes.