diff --git a/common/combat/damaging.trait.js b/common/combat/damaging.trait.js
index 30303ef..a0127cc 100644
--- a/common/combat/damaging.trait.js
+++ b/common/combat/damaging.trait.js
@@ -35,11 +35,13 @@ export class Damaging extends Trait {
   }
 
   tick(elapsed) {
-    const isCollidingWith = this.entity.isCollidingWith;
-    for (let i = 0; i < isCollidingWith.length; ++i) {
-      const entity = isCollidingWith[i];
-      if (entity.is('vulnerable') && !entity.isInvulnerable) {
-        entity.takeDamageFrom(this.entity);
+    if (AVOCADO_SERVER) {
+      const isCollidingWith = this.entity.isCollidingWith;
+      for (let i = 0; i < isCollidingWith.length; ++i) {
+        const entity = isCollidingWith[i];
+        if (entity.is('vulnerable') && !entity.isInvulnerable) {
+          entity.takeDamageFrom(this.entity);
+        }
       }
     }
   }
diff --git a/common/combat/vulnerable.trait.js b/common/combat/vulnerable.trait.js
index deb6361..965ae5c 100644
--- a/common/combat/vulnerable.trait.js
+++ b/common/combat/vulnerable.trait.js
@@ -77,7 +77,7 @@ export class Vulnerable extends Trait {
           else {
             damage.from = undefined;
           }
-          this.entity.emit('tookDamage', damage, 'client');
+          this.acceptDamage(damage);
         }
         break;
       default:
@@ -86,6 +86,24 @@ export class Vulnerable extends Trait {
     }
   }
 
+  acceptDamage(damage) {
+    const context = createContext();
+    context.add('entity', this.entity);
+    context.add('damage', damage);
+    const actions = behaviorItemFromJSON(
+      this._tookDamageActionsJSON
+    );
+    const tuple = {
+      context,
+      actions,
+    };
+    this.tookDamageActions.push(tuple);
+    actions.on('actionsFinished', () => {
+      const index = this.tookDamageActions.indexOf(tuple);
+      this.tookDamageActions.splice(tuple);
+    });
+  }
+
   addEmitter() {
     if (!this._isHydrating) {
       return;
@@ -129,27 +147,6 @@ export class Vulnerable extends Trait {
   listeners() {
     return {
 
-      tookDamage: (damage, source) => {
-        if ('server' === source) {
-          return;
-        }
-        const context = createContext();
-        context.add('entity', this.entity);
-        context.add('damage', damage);
-        const actions = behaviorItemFromJSON(
-          this._tookDamageActionsJSON
-        );
-        const tuple = {
-          context,
-          actions,
-        };
-        this.tookDamageActions.push(tuple);
-        actions.on('actionsFinished', () => {
-          const index = this.tookDamageActions.indexOf(tuple);
-          this.tookDamageActions.splice(tuple);
-        });
-      },
-
       dying: () => {
         this._isInvulnerable = true;
       },
@@ -206,7 +203,7 @@ export class Vulnerable extends Trait {
             from: entity.instanceUuid,
           };
           this.damageList[entity.instanceUuid].push(damage);
-          this.entity.emit('tookDamage', damage, 'server');
+          this.entity.emit('tookDamage', damage);
         }
       },
 
diff --git a/webpack.client.config.js b/webpack.client.config.js
index d5a0d05..3a46a2a 100644
--- a/webpack.client.config.js
+++ b/webpack.client.config.js
@@ -52,5 +52,9 @@ config.plugins.push(new HtmlWebpackPlugin({
 config.plugins.push(new webpack.ProvidePlugin({
   THREE: 'three',
 }));
+config.plugins.push(new webpack.DefinePlugin({
+  AVOCADO_CLIENT: true,
+  AVOCADO_SERVER: false,
+}));
 
 module.exports = config;
diff --git a/webpack.server.config.js b/webpack.server.config.js
index 47abeae..ef57019 100644
--- a/webpack.server.config.js
+++ b/webpack.server.config.js
@@ -37,7 +37,10 @@ config.plugins.push(new StartServerPlugin({
   nodeArgs: nodeArgs,
   signal: true,
 }));
-
+config.plugins.push(new webpack.DefinePlugin({
+  AVOCADO_CLIENT: false,
+  AVOCADO_SERVER: true,
+}));
 config.target = 'node';
 
 module.exports = config;