diff --git a/js/engine.js b/js/engine.js
index aa678ab..f5e81ba 100644
--- a/js/engine.js
+++ b/js/engine.js
@@ -78,33 +78,50 @@ function mobCollisionChecks(event) {
   for (let i = 0, j = pairs.length; i != j; i++) {
 
     //body + player collision
-    if (pairs[i].bodyA === playerBody || pairs[i].bodyA === playerHead) {
-      collidePlayer(pairs[i].bodyB)
-    } else if (pairs[i].bodyB === playerBody || pairs[i].bodyB === playerHead) {
-      collidePlayer(pairs[i].bodyA)
-    }
+    // if (mech.damageImmune < mech.cycle) {
+    //   if (pairs[i].bodyA === playerBody || pairs[i].bodyA === playerHead) {
+    //     collidePlayer(pairs[i].bodyB)
+    //   } else if (pairs[i].bodyB === playerBody || pairs[i].bodyB === playerHead) {
+    //     collidePlayer(pairs[i].bodyA)
+    //   }
+    // }
 
-    function collidePlayer(obj, speedThreshold = 12) {
-      if (obj.classType === "body" && obj.speed > speedThreshold && obj.mass > 2) {
-        const v = Matter.Vector.magnitude(Matter.Vector.sub(player.velocity, obj.velocity));
-        if (v > speedThreshold && mech.damageImmune < mech.cycle) {
-          mech.damageImmune = mech.cycle + 30; //player is immune to collision damage for 30 cycles
-          let dmg = Math.sqrt(v * obj.mass) * 0.01;
-          console.log(`mass = ${obj.mass} \n`, `dmg = ${dmg}\n`, `v = ${v}\n`)
-          // console.log(v, dmg)
-          mech.damage(dmg);
-          game.drawList.push({
-            //add dmg to draw queue
-            x: pairs[i].activeContacts[0].vertex.x,
-            y: pairs[i].activeContacts[0].vertex.y,
-            radius: dmg * 500,
-            color: game.mobDmgColor,
-            time: game.drawTime
-          });
-          return;
-        }
-      }
-    }
+    // function collidePlayer(obj, speedThreshold = 12, massThreshold = 2) {
+    //   if (obj.classType === "body" && obj.speed > speedThreshold && obj.mass > massThreshold) { //dmg from hitting a body
+    //     const v = Matter.Vector.magnitude(Matter.Vector.sub(player.velocity, obj.velocity));
+    //     if (v > speedThreshold) {
+    //       mech.damageImmune = mech.cycle + 30; //player is immune to collision damage for 30 cycles
+    //       let dmg = Math.sqrt((v - speedThreshold + 0.1) * (obj.mass - massThreshold)) * 0.02;
+    //       dmg = Math.min(Math.max(dmg, 0.02), 0.2);
+    //       // console.log(`mass = ${obj.mass} \n`, `dmg = ${dmg}\n`, `v = ${v}\n`)
+    //       // console.log(v, dmg)
+    //       mech.damage(dmg);
+    //       game.drawList.push({
+    //         //add dmg to draw queue
+    //         x: pairs[i].activeContacts[0].vertex.x,
+    //         y: pairs[i].activeContacts[0].vertex.y,
+    //         radius: dmg * 500,
+    //         color: game.mobDmgColor,
+    //         time: game.drawTime
+    //       });
+    //       return;
+    //     }
+    //   } else if (obj.isStatic && player.speed > speedThreshold * 2) { //falling dmg / hitting map dmg
+    //     mech.damageImmune = mech.cycle + 30;
+    //     console.log(player.speed)
+    //     let dmg = Math.min(Math.max(player.speed * 0.001, 0.02), 0.2);
+    //     mech.damage(dmg);
+    //     game.drawList.push({
+    //       //add dmg to draw queue
+    //       x: pairs[i].activeContacts[0].vertex.x,
+    //       y: pairs[i].activeContacts[0].vertex.y,
+    //       radius: dmg * 500,
+    //       color: game.mobDmgColor,
+    //       time: game.drawTime
+    //     });
+    //     return;
+    //   }
+    // }
 
     //mob + (player,bullet,body) collisions
     for (let k = 0; k < mob.length; k++) {