diff --git a/16/src/main.rs b/16/src/main.rs
index 6611bc7..e7b6d0d 100644
--- a/16/src/main.rs
+++ b/16/src/main.rs
@@ -1,4 +1,3 @@
-use std::collections::HashSet;
 use std::fmt::Display;
 use std::fs::File;
 use std::io::{BufRead, BufReader, Lines};
@@ -153,37 +152,29 @@ impl Contraption {
     }
     fn cast_ray<'a>(&'a mut self, pos: (i64, i64), dir: FromDirection) -> VisitState {
         let mut state = self.empty_state();
-        let mut new_rays = self.cast_ray_inner(&mut state, pos, dir);
-        while new_rays.len() != 0 {
-            new_rays = new_rays
-                .iter()
-                .flat_map(|(pos, dir)| self.cast_ray_inner(&mut state, *pos, *dir))
-                .collect();
-        }
+        self.cast_ray_inner(&mut state, pos, dir);
         state
     }
     fn cast_ray_inner<'a>(
         &'a mut self,
         state: &'a mut VisitState,
-        mut pos: (i64, i64),
-        mut dir: FromDirection,
-    ) -> Vec<((i64, i64), FromDirection)> {
-        let mut new_rays = Vec::new();
-
-        while pos.0 >= 0 && pos.1 >= 0 && pos.0 < self.width() && pos.1 < self.height() {
-            if !state.visit(pos, dir) {
-                break;
-            }
-            dir = match dir.interact(self.tiles[pos.1 as usize][pos.0 as usize]) {
-                Interaction::One(dir) => dir,
+        pos: (i64, i64),
+        dir: FromDirection,
+    ) {
+        if pos.0 >= 0
+            && pos.1 >= 0
+            && pos.0 < self.width()
+            && pos.1 < self.height()
+            && state.visit(pos, dir)
+        {
+            match dir.interact(self.tiles[pos.1 as usize][pos.0 as usize]) {
+                Interaction::One(dir) => self.cast_ray_inner(state, dir.goes_pos(pos), dir),
                 Interaction::Two((dir1, dir2)) => {
-                    new_rays.push((pos, dir1));
-                    dir2
+                    self.cast_ray_inner(state, dir1.goes_pos(pos), dir1);
+                    self.cast_ray_inner(state, dir2.goes_pos(pos), dir2);
                 }
             };
-            pos = dir.goes_pos(pos);
         }
-        new_rays
     }
     fn empty_state(&self) -> VisitState {
         let mut visited_from = Vec::new();