Misc bugfixes

core/src/mindustry/entities/bullet/BulletType.java

@@ -232,8 +232,8 @@ public class BulletType extends Content implements Cloneable{
         }
 
         if(entity instanceof Unit unit){
-            Tmp.v3.set(unit).sub(b.x, b.y).nor().scl(knockback * 80f);
-            if(impact) Tmp.v3.setAngle(b.rotation());
+            Tmp.v3.set(unit).sub(b).nor().scl(knockback * 80f);
+            if(impact) Tmp.v3.setAngle(b.rotation() + (knockback < 0 ? 180f : 0f));
             unit.impulse(Tmp.v3);
             unit.apply(status, statusDuration);
         }

core/src/mindustry/entities/comp/BuildingComp.java

@@ -106,7 +106,6 @@ abstract class BuildingComp implements Posc, Teamc, Healthc, Buildingc, Timerc,
 
     /** Sets up all the necessary variables, but does not add this entity anywhere. */
     public Building create(Block block, Team team){
-        this.tile = emptyTile;
         this.block = block;
         this.team = team;
 

core/src/mindustry/entities/comp/PhysicsComp.java

@@ -2,6 +2,7 @@ package mindustry.entities.comp;
 
 import arc.math.*;
 import arc.math.geom.*;
+import arc.util.*;
 import mindustry.annotations.Annotations.*;
 import mindustry.async.PhysicsProcess.*;
 import mindustry.gen.*;