diff --git a/js/game.js b/js/game.js
index 66f4037..fa0d5c2 100644
--- a/js/game.js
+++ b/js/game.js
@@ -1270,15 +1270,20 @@ export class Level {
         let success = false;
         for (let dest of teleporter.type.teleport_dest_order(teleporter, this, actor)) {
             // Teleporters already containing an actor are blocked and unusable
+            // FIXME should check collision?
             if (dest.cell.some(tile => tile.type.is_actor && tile !== actor))
                 continue;
 
             // Physically move the actor to the new teleporter
             // XXX lynx treats this as a slide and does it in a pass in the main loop
             // XXX not especially undo-efficient
+            // FIXME the new aggressive move checker could help here!
             this.remove_tile(actor);
             this.add_tile(actor, dest.cell);
 
+            // FIXME teleport overrides...  also allow block slapping...  seems like horizontal
+            // wins...
+
             // Red and green teleporters attempt to spit you out in every direction before
             // giving up on a destination (but not if you return to the original).
             // Note that we use actor.direction here (rather than original_direction) because
diff --git a/js/tiletypes.js b/js/tiletypes.js
index 9d6579b..aadbefa 100644
--- a/js/tiletypes.js
+++ b/js/tiletypes.js
@@ -2058,8 +2058,9 @@ const TILE_TYPES = {
     dynamite_lit: {
         draw_layer: DRAW_LAYERS.item,
         is_actor: true,
-        // FIXME collision?
-        // FIXME kills player on touch
+        is_monster: true,
+        // FIXME ???????
+        collision_mask: COLLISION.block_cc2,
         // FIXME inherits a copy of player's inventory!
         // FIXME holds down buttons, so needs an on_arrive
         // FIXME speaking of buttons, destroyed actors should on_depart
@@ -2155,14 +2156,18 @@ const TILE_TYPES = {
         draw_layer: DRAW_LAYERS.actor,
         is_actor: true,
         has_inventory: true,
-        // FIXME collision...?
+        // FIXME ???????
+        collision_mask: COLLISION.block_cc2,
         // FIXME do i start moving immediately when dropped, or next turn?
         movement_speed: 4,
         decide_movement(me, level) {
             return [me.direction];
         },
         // FIXME feel like this should be on_blocked?
+        // FIXME specific case for player!
         on_bump(me, level, other) {
+            if (me.slide_mode)
+                return;
             if (other.type.is_actor) {
                 level.transmute_tile(me, 'explosion');
                 level.transmute_tile(other, 'explosion');