Allen went over in the final minute, scoring his second try for the Welsh region, to secure a 33-27 victory and one he insisted stemmed from a complete understanding of individual responsibility.
At just 22 and with only eight previous appearances for Ospreys, including coming off the bench in the RaboDirect PRO12 win over Leinster earlier in the season, Allen admitted his position of seniority amongst the squad was unusual but felt everyone displayed a mature head on their youthful shoulders.
And having been through the same situation himself, Allen believes everyone stepped up on Friday night, testament to the communication built on during a hard week of training.
"We had a lot of boys making their debuts, first starts, or boys with just one or two games behind them, and I think they showed they are worthy of the jersey," said Allen.
"The English sides always have strength in depth, they are always physical, but we've shown that we are developing as a team, bringing youngsters through, and showing what we're about.
"We set out what we wanted to do in the week, we wanted to build on from what we did against Leinster, and I think it was a good effort from the boys.
"It felt a bit weird in the build-up when people were talking about all the youngsters and I thought' that's me, surely?'
"Yes, I'm older and more experienced than a lot of the boys in the 23 so I had to try and stand up and show some leadership for the younger boys out there.
"We trained hard all week, there was a lot of talking on the training pitch, making sure the boys coming in knew what was expected of them and what they roles were, if they weren't sure they knew they just had to ask.
"We've all been there, coming into the group and being a little unsure so we've all had to help each other out and that makes a difference as it meant everybody felt comfortable.
"It paid off because it was obvious out there, especially with the try at the end, that people knew what they job was."
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