What the heck can you do vs the Mantis?

I’ll keep it short:

what the HECK can you do vs a Mantis on Ragnarok when your team’s vehicles have been lost?

I’ve had several direct hits with the Splaser but it has only taken away it’s shield. What the heck are you supposed to do to kill a Mantis? (also very difficult to board it due to open layout of the map making it hard to get anywhere close to it)

Any tips are welcome because I can’t figure this out.