From a distance, the Strelac will shoot projectiles from its horns and the speed that it fires can leave an opponent unable to counterattack. At close range, the Strelac will emit a gas that distorts vision and can spew a toxic liquid that can drain the player's health quickly if they are not careful. Strelac are quite resistant to gunfire but are very vulnerable to melee attacks which can dispose of them quickly. Strelac are also vulnerable to the Anti-Materiel Rifle.
The best way to take them down is to slide onto them and do the QTE when pressing the action button while they're stunned.