A Pony would turn this emergency into an inconvenience...
So would a decent buddy.
That notwithstanding, a HP hose rupture is hardly an emergency. I'd wager you could ascend casually from 90 ft, do a half depth stop, do a full safety stop, and ascend to the surface normally, if you had done reasonable gas planning in the first place. I did 90 minutes in the pool this week on an AL80 with a faulty HP hose. It's just not that big a deal.
While I was in Roatan, my DM blew his HP hose at the start of the dive. I went up and asked if he was ok and he still did the entire 40 minute dive and got back on the boat with 1000 PSI, all the time watching all this air escape out his hose.
