Ben Foden promises Northampton backlash against Ulster in the Heineken Cup The England full-back described the 25-6 defeat eight days ago as one of the most emphatic of his Northampton career. Foden was particularly critical of his own performance, tweeting afterwards that he had a "terrible game." If Northampton are to bring to an end Ulster's 13-match winning streak in all competitions and keep alive their faint hopes of reaching the knockout stages, Foden admits it will require a radically improved display by the 2011 Heineken Cup finalists. Yet even without their inspirational captain, Dylan Hartley, who has been suspended after striking Ulster hooker Rory Best during the defeat on Dec 7, Foden says Northampton are in "dangerous" mood ahead of their trip to Belfast. "There's a big belief in our squad that we can go and test them at Ravenhill," Foden said. A lot of ­people will write us off, which is probably a good thing. We're probably at our most dangerous when teams take us for granted and we'll be looking to put in a big performance this ­weekend. The performance [at Franklin's Gardens] let us down, individually and as a team. There's no finger pointing individually, we sat down and took the blame as a team. For us it's pride, it's getting things back on track. We're a very proud side, we want to be performing. I think we still have a chance [of qualifying] we can win all our games and pick up a couple of bonus points. Foden blames his own poor performance on a combination of "rustiness and laziness" having played just one game previously after a three-month lay-off with an ankle injury. To go to a high-intensity game - the closest thing at club level to international rugby you are going to get - I probably took things a little bit for granted that I would still be able to do it. I was found wanting in some areas, making poor decisions and finding myself out of position. It was a little bit of rustiness and a little bit of laziness probably as well. It was probably the little wake-up call that I need to be honest, to get my head right. Ulster were particularly successful against the English side in forcing a number of turnovers using the "choke tackle" favoured by the Ireland side in which the tackler holds up the ball carrier, turning the breakdown into a maul. "They have got this hold-up system that works really well and have quality players through this team and we will have to be on our best if we are going to test them," Foden said. We have worked a lot this week with Westy [forward coach Dorian West] in the contact area about getting our leg drive right and getting a latch to make sure we aren't getting held up in the tackle.