Quoted from MikeS:

It will hold the ball in the control lane sometimes but it behaves quite differently than how the Premium/LE locks the ball.
Here's the Raptor Tri-ball rule-sheet (Look at the end section on 2X Scoring)
Raptor Tri-Ball (RTB)
Raptor Capture: Complete the Raptor Pen standup targets two times (increasing by one for each subsequent RTB) to light the Raptor Lock. A shot to the dead end lane will instantly count as a completion of all of the targets. The Raptor Lock (Capture) can only be made as a shot to the dead end lane.
Electric Fence Integrity: After a raptor has been captured, additional shots to the enclosure will weaken the fence and start RTB when the integrity is at 0%, with a shot to the dead end lane. The first Raptor Tri-Ball starts with the fence at 50% integrity. The fence integrity decreases more on shots to the dead end lane. The lightning bolt inserts will flash when RTB is ready to start with the final shot.
Worth noting - you can also start Raptor Tri-Ball for free off of a lucky Smart Missile where you select the option and successfully make the shot.
Raptor Tri-Ball is a multi-phase multiball, with rule elements that pay homage to multiballs in older Data East games:
Phase 1 - Raptor Tri-Ball: Shoot the left and right ramps once each for a Raptor Jackpot. The second Jackpot is worth double that of the first. The Jackpot value increases with switch hits (by how much?)
Phase 2 - Raptor Chaos: The CHAOS letters will light. Shoot all the CHAOS shots (not necessarily in order) for Raptor Chaos Jackpots worth 1/5 of the Double Jackpot value.
Phase 3 - Raptor Rampage: Raptor Tri-Ball becomes "Raptor Hex-Ball”! (or “Raptor Quint-Ball”). 3 more balls are now in play, but no more than 6. Super Jackpots are lit on the right ramp and upper loop, with the base value of the Double Jackpot, and are multiplied by the number of balls in play. The second Jackpot, once again, will be worth double the value of the first Jackpot. Get 2x Scoring ready during this phase, and watch your score skyrocket! Collecting either Super Jackpot will also award you with a Fossil for your efforts.
Phase 4 - Victory Laps: After collecting both supers, all shots are lit for Raptor Rampage victory lap jackpots worth the same value as the Raptor Chaos Jackpots, multiplied by # of balls still in play. Each shot unlights when you shoot it, but you can relight them all by shooting the Raptor Pen center target. However, each time you complete them prior to shooting Raptor Pen, the last one awards a Raptor Rampage super jackpot worth the sum of your victory laps collected after your prior Raptor Rampage super.
Raptor Tri-Ball 2x Scoring (PREMIUM / LE ONLY): On the Premium / LE models, hitting all three targets in the Raptor Pen and then making the center lane will temporarily lock a ball and double all Jackpots collected for 15 seconds. Hitting the captive ball will reset the 15 second timer.
RTB progress is not saved between RTB’s, and during each RTB, your progress does not loop back around to Phase 1 after you collect a Phase 4 super.