Hull FC scored 22 unanswered points in the last 20 minutes of the game to claim victory.
“I thought we ran out of troops, with 11 minutes left we were out of subs,” Webster told Sky Sports.
“We had a lot of people playing today busted and bruised.
“I thought there were some big momentum changes in the game – the kick chase that we didn’t do, the fourth and fifth tackle penalties that we gave away.
“I thought that we got some calls against us, and once they got some momentum we weren’t good enough to defend it.
“That’s where we’re at at the moment – we’re not quite good enough to get 80 minutes done.
“There’s lots of of factors with that, one is experience, and two, we’ve got 11 or 12 blokes training at the moment.
“We’ve got five or six blokes needling themselves up to get out on pitch – but that’s rugby league.
“We’ve got an extremely small squad and we’re down to the bare bones.
“But I can’t take anything away from Hull today. Congratulations to them. We’ll have to learn from this one and get ready for Wigan on Monday.”