Leinster's Joe McCarthy, left, and brother Paddy McCarthy during last Friday night's URC encounter with Ulster at the Aviva Stadium. Photo: Brendan Moran/Sportsfile

Leinster’s Joe McCarthy, left, and brother Paddy McCarthy during last Friday night’s URC encounter with Ulster at the Aviva Stadium. Photo: Brendan Moran/Sportsfile

Leinster’s Jekyll and Hyde season is best encapsulated by their erratic performances in each half of their previous two games.

In Welford Road last week, despite dominating territory and possession, Leinster trailed Leicester Tigers 15-6 at half-time before a big impact from their bench, led by try-scoring hooker Dan Sheehan saw them overturn the nine-point deficit and run out 23-15 winners in the Champions Cup.