From Halopedia, the Halo wiki
This variant was supposed to make an appearance in the game. It was removed permanently from the finalized version of Halo 2. However, one tag remained within the game, due to oversight by Bungie staff.
- ^ halo.bungie.org: Re: Sentinels with needlers? (Evil Otto: "We used to have sentinels that dropped needler weapons but ended up cutting them. If you found one we missed, I would be very interested if you could verify it.")
- ^ halo.bungie.org: Re: Sentinels with needlers? (Dojorkan: "I wouldnt say its a glitch just a mistake. Say of they use a drop down box to select a weapon from the list of weapons, his mouse could have simply slipped and selected a needler.")