Thrown monsters' full push

Verified against the spelunky.ai port v0.1.11 on 28 October 2026.

A thrown item that hits a monster hurts it and pushes it along at 0.3 of the item's speed. A thrown monster, stunned and flying, hurts the monsters it hits the same way, but pushes them with all of its speed, as the line that would cut it to 0.3 is commented out. So a Rock knocks a Caveman back a little, and the Caveman, thrown, sends a Yeti across the room.

The player throws a Rock at a charging Caveman: it stuns the Caveman and knocks it back a little, with 0.3 of the Rock's speed. He picks the stunned Caveman up and throws it on the run into a Yeti, which takes all of the Caveman's speed and flies to the far wall ^[1].

A thrown item's step sets the monster it hits moving at the item's speed, obj.xVel = xVel ^[2], and after the hit sets it again, to 0.3 of that:

                obj.xVel = xVel * 0.3;

The first line is dead: nothing between reads it. A stunned monster moving faster than 2 pixels a step runs much the same check in oEnemy's step, with the first line kept for a monster that isn't stunned or dead itself:

// moving projectile
if (status == 98)
{
    if ((abs(xVel) > 2 or abs(yVel) > 2))
    {
        obj = collision_rectangle(x, y, x+16, y+16, oEnemy, false, true);
        if (obj)
        {
            if (not obj.invincible and obj.type != "Magma Man")
            {
                if (obj.status < 98) obj.xVel = xVel;

But its second line is commented out, // obj.xVel = xVel * 0.3; ^[3], so the first one stands, and the monster it hits takes all of its speed ^[4].

Stun a monster, pick it up, and throw it on the run into another: the one it hits flies off at the thrown one's speed. Throw a Rock at the same monster and it moves only a little. Play does it with every thrown item's hit and every stunned monster thrown or knocked into another (Throwing). The replay of the clip's staged scene, a custom level, has a Rock, a Caveman and a Yeti in a corridor. The Rock, thrown standing at 8 pixels a step, stuns the Caveman and knocks it back at 2.4. The stunned Caveman, thrown on the run at 6.9, stuns the Yeti, which takes all of its speed, 6.7, and flies to the far wall ^[5].

The spelunky.ai port reproduces it exactly: it's in docs/quirks.md's list of the 1.1 source's bugs ^[4], and the oracle's fingerprint of the replay pins both pushes. No option turns it off.