1st Phase - Use 'Web Retreat' with when the lasers are targeting you and press to 'Web Shoot' the blue marker. He will then attack you, dodge with when prompted then to 'Web Strike' the orange marker, repeat, then press to save the helicopter when prompted.
2nd Phase - On top of helipad. Avoid it's attacks: tentacle swipes by jumping and strafing all while pressing to shoot web in it's eyes, when prompted dodge with and to 'Web Strike' and pull the orange core out with . Repeat. When it fires lasers at you, just jump over them.