Why does Titan execution not trigger when meleeing a doomed Titan

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This question was already asked and answered for Titanfall 1, but I wonder if there are any differences for Titanfall 2.
I just had this situation where I (in Ronin) meleed another Titan who was doomed at least three times. We were hitting each other and then I was doomed to and he performed an execution on me, which was very frustrating. (My Sword Core was NOT activated at that moment.)
I felt like this was happening before, so I wanted to ask:
Is there more to Titan executions than meleeing a doomed Titan?
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How do you execute a doomed titan?
The execution is also greatly simplified: simply performing a melee attack on an enemy Titan that's in the Doomed state will trigger a Termination. Disarm your opponent using laser precision. Rips the arm off the Titan after its attempt to punch her using a Laser Shot.TITANFALL 2 - Melee \u0026 Execution Guide
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Images: Andrea Piacquadio, Tima Miroshnichenko, Thang Cao, RODNAE Productions