Tips for the Hellion Kills Kahl challenge please

Getting this to count is very finicky as it seems you have to actually have the jetpack going at the moment of the kill, but even then it often doesn't seem to count. Is there some trick to getting this to count reliably?

Thanks

submitted by /u/Spaced-Invader
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source https://www.reddit.com/r/Warframe/comments/11jlmb1/tips_for_the_hellion_kills_kahl_challenge_please/