>Try to talk to it. You've made a little headway with previous enemies. There are plenty of things to confront it with. The missing members, the fight its had so far, its status among the City's elite Digimon, whatever you can think of to stall it. This could give Kaus Gammamon time to get back in the fight, while also allowing your OOPART progress to increase. However, if it doesn't like what you have to say, or is uninterested, it could attack instantly and waste your shot. (Write-in)

>Have Porcupamon escort you to the alcove. He can't fight while defending you, that much is clear. You need to run to safety so your partner can fully focus on the battle. This will necessitate tanking and taking some hits, which risks the OOPART being knocked out of place once more.

>Team up with Kaus Gammamon. Get over to him so that the two Champion Digimon can fight side-by-side. This killer is strong, but maybe your two allies can capitalize on any mistakes through teamwork. However, you can't separate yourself from Porcupamon, or you'll be stabbed as soon as you're unguarded. This approach will leave you stranded in the middle of the chaos, and they'll have to commit to protecting you.