--- a/mhrok.js	Wed Oct 31 18:19:45 2012 +0100
+++ b/mhrok.js	Wed Oct 31 18:31:08 2012 +0100
@@ -305,25 +305,28 @@
         return false;
     };
 
-    var Razor = function (x, y, direction) {
+    var Razor = function (x, y, direction, level) {
         MhrokLib.Mob.apply(this, arguments);
         this.x = x * 32;
         this.y = y * 24;
         this.z = y;
         this.direction = direction;
         this.ttl = 100;
+        this.level = level;
     };
     Razor.prototype = Object.create(MhrokLib.Mob.prototype);
     Razor.prototype.classes += ' mhrok-razor';
     Razor.prototype.animate = function (frame) {
         var dir = this.directions[this.direction];
+        var x = Math.round(this.x / 32 - dir[0]);
+        var y = Math.round(this.y /24 - dir[1]);
         this.frame = (this.frame + 1) % 8;
         this.frameX = 0;
         this.frameY = this.frame;
         this.x += dir[0] * 8;
         this.y += dir[1] * 6;
         this.ttl -= 1;
-        if (this.ttl <= 0) {
+        if (this.ttl <= 0 || this.level.isBlocked(x + dir[0], y + dir[1])) {
             this.dead = true;
         };
     };
@@ -365,7 +368,7 @@
     };
     Hero.prototype.stab = function (game) {
         this.animation = 'stab';
-        game.mobs.push(new Razor(this.x/32, this.y/24, this.direction));
+        game.mobs.push(new Razor(this.x/32, this.y/24, this.direction, game.level));
         return true;
     };